fix(deps): move test-only deps to devDeps

package.json

@@ -37,26 +37,25 @@
   ],
   "dependencies": {
     "agentkeepalive": "^3.1.0",
-    "bluebird": "^3.5.0",
     "cacache": "^7.0.3",
-    "checksum-stream": "^1.0.2",
     "http-proxy-agent": "^1.0.0",
     "https-proxy-agent": "^1.0.0",
     "http-cache-semantics": "^3.7.3",
     "lru-cache": "^4.0.2",
     "mississippi": "^1.2.0",
     "node-fetch": "2.0.0-alpha.3",
     "promise-retry": "^1.1.1",
-    "safe-buffer": "^5.0.1",
     "socks-proxy-agent": "^2.0.0",
     "ssri": "^4.0.0"
   },
   "devDependencies": {
+    "bluebird": "^3.5.0",
     "mkdirp": "^0.5.1",
     "nock": "^9.0.6",
     "npmlog": "^4.0.1",
     "nyc": "^10.0.0",
     "rimraf": "^2.5.4",
+    "safe-buffer": "^5.0.1",
     "standard": "^10.0.1",
     "standard-version": "^4.0.0",
     "tacks": "^1.2.6",