Fix runkit exapmle (former tonic)

example.js

@@ -0,0 +1,11 @@
+const { MultiRange, multirange } = require('multi-integer-range');
+
+// Just a nice shorthand for you
+const mr = value => multirange(value, { parseUnbounded: true, parseNegative: true });
+
+// Basic manipulation
+const range = mr('1-5, 9, 8').append(10).subtract(1);
+console.log(range.toString());
+
+// Iterator & array spread
+console.log([...mr('(-103)-(-100), 101-103')]);

package.json

@@ -27,5 +27,5 @@
     "mocha-lcov-reporter": "^1.2.0",
     "typescript": "~2.4.1"
   },
-  "tonicExample": "import MultiRange, { multirange } from 'multi-integer-range';"
+  "runkitExampleFilename": "example.js"
 }