Small dependency fix.

Author: ionut.stan

package.json

@@ -40,7 +40,9 @@
     "jssha": "^2.2.0",
     "node-fetch": "^1.6.3",
     "whatwg-fetch": "^2.0.3",
-    "ws": "^2.2.3"
+    "ws": "^2.2.3",
+    "babel-polyfill": "^6.23.0",
+    "babel-runtime": "^6.23.0"
   },
   "devDependencies": {
     "@types/node": "^7.0.13",
@@ -49,10 +51,8 @@
     "babel-loader": "^6.4.1",
     "babel-plugin-async-to-promises": "^1.0.5",
     "babel-plugin-remove-comments": "^2.0.0",
-    "babel-polyfill": "^6.23.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-stage-3": "^6.24.1",
-    "babel-runtime": "^6.23.0",
     "eslint": "^3.19.0",
     "eslint-plugin-jsdoc": "^3.0.2",
     "phantom": "^4.0.2",