diff --git a/package-lock.json b/package-lock.json
index 40053e6..e119a5a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -304,7 +304,7 @@
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-          "resolved": "http://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
+          "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
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@@ -743,7 +743,7 @@
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-          "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "dev": true,
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@@ -863,7 +863,7 @@
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
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@@ -882,7 +882,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
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@@ -935,7 +935,7 @@
         },
         "json5": {
           "version": "0.5.1",
-          "resolved": "http://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
           "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
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@@ -1115,7 +1115,7 @@
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-          "resolved": "http://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",
           "integrity": "sha1-RsP+yMGJKxKwgz25vHYiF226s0s=",
           "dev": true
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@@ -2112,7 +2112,7 @@
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-      "resolved": "http://registry.npmjs.org/cacache/-/cacache-10.0.4.tgz",
+      "resolved": "https://registry.npmjs.org/cacache/-/cacache-10.0.4.tgz",
       "integrity": "sha512-Dph0MzuH+rTQzGPNT9fAnrPmMmjKfST6trxJeK7NQuHRaVw24VzPRWTmg9MpcwOVQZO0E1FBICUlFeNaKPIfHA==",
       "dev": true,
       "requires": {
@@ -2375,7 +2375,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
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@@ -2879,9 +2879,9 @@
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-      "version": "6.4.1",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.1.tgz",
-      "integrity": "sha512-BsXLz5sqX8OHcsh7CqBMztyXARmGQ3LWPtGjJi6DiJHq5C/qvi9P3OqgswKSDftbu8+IoI/QDTAm2fFnQ9SZSQ==",
+      "version": "6.5.3",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
+      "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
       "dev": true,
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@@ -3352,7 +3352,7 @@
       "dependencies": {
         "json5": {
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-          "resolved": "http://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
           "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
           "dev": true
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@@ -3508,7 +3508,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3529,12 +3530,14 @@
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           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
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             "concat-map": "0.0.1"
@@ -3549,17 +3552,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
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@@ -3676,7 +3682,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3688,6 +3695,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3702,6 +3710,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -3709,12 +3718,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -3733,6 +3744,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3813,7 +3825,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -3825,6 +3838,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -3910,7 +3924,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -3946,6 +3961,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3965,6 +3981,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4008,12 +4025,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -4042,7 +4061,7 @@
     },
     "get-stream": {
       "version": "3.0.0",
-      "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
       "integrity": "sha1-jpQ9E1jcN1VQVOy+LtsFqhdO3hQ=",
       "dev": true
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@@ -5486,7 +5505,7 @@
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           "version": "11.1.0",
-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
@@ -5795,7 +5814,7 @@
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         "yargs": {
           "version": "11.1.0",
-          "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
@@ -6102,7 +6121,7 @@
       "dependencies": {
         "json5": {
           "version": "0.5.1",
-          "resolved": "http://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
           "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
           "dev": true
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@@ -6739,7 +6758,7 @@
     },
     "os-locale": {
       "version": "1.4.0",
-      "resolved": "http://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
       "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
       "requires": {
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@@ -6937,7 +6956,7 @@
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     "pify": {
       "version": "2.3.0",
-      "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
       "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
       "dev": true
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@@ -7644,7 +7663,7 @@
       "dependencies": {
         "jsesc": {
           "version": "0.5.0",
-          "resolved": "http://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
           "integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=",
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@@ -10465,7 +10484,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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@@ -10536,7 +10555,7 @@
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     "yargs": {
       "version": "3.32.0",
-      "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz",
       "integrity": "sha1-AwiOnr+edWtpdRYR0qXvWRSCyZU=",
       "requires": {
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@@ -10573,7 +10592,7 @@
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         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
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