refactor(build): Use babel-runtime instead of es6-promise polyfill

Fixes #358

Author: mtscout6

gulpfile.babel.js

@@ -48,7 +48,7 @@ const externalConfig = {
    external: [
       'axios',
       'js-base64',
-      'es6-promise',
+      'babel-runtime',
       'debug',
       'utf8'
    ],

lib/Requestable.js

@@ -8,14 +8,9 @@
 import axios from 'axios';
 import debug from 'debug';
 import {Base64} from 'js-base64';
-import {polyfill} from 'es6-promise';
 
 const log = debug('github:request');
 
-if (typeof Promise === 'undefined') {
-   polyfill();
-}
-
 /**
  * The error structure returned when a network call fails
  */

package.json

@@ -26,14 +26,8 @@
     ],
     "plugins": [
       "add-module-exports",
-      [
-        "transform-es2015-modules-umd",
-        {
-          "globals": {
-            "es6-promise": "Promise"
-          }
-        }
-      ]
+      "transform-runtime",
+      "transform-es2015-modules-umd"
     ],
     "env": {
       "development": {
@@ -47,15 +41,16 @@
   ],
   "dependencies": {
     "axios": "^0.10.0",
+    "babel-runtime": "^6.9.2",
     "debug": "^2.2.0",
-    "es6-promise": "^3.0.2",
     "js-base64": "^2.1.9",
     "utf8": "^2.1.1"
   },
   "devDependencies": {
     "babel-core": "^6.7.7",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-es2015-modules-umd": "^6.5.0",
+    "babel-plugin-transform-runtime": "^6.9.0",
     "babel-preset-es2015": "^6.5.0",
     "babel-register": "^6.7.2",
     "babelify": "^7.3.0",