fix: updated rollup code - hopefully fixing the bundling issue

Author: ColinEberhardt

Diff for: .babelrc

@@ -1,5 +1,6 @@
 {
   "presets": [
-    "es2015-rollup"
-  ]
+    ["es2015", { "modules": false }]
+  ],
+  "plugins": ["external-helpers"]
 }

Diff for: package.json

@@ -11,13 +11,14 @@
     "url": "https://github.com/ColinEberhardt/json-transforms"
   },
   "devDependencies": {
-    "babel-preset-es2015-rollup": "^1.1.1",
+    "babel-plugin-external-helpers": "^6.8.0",
+    "babel-preset-es2015": "^6.14.0",
     "eslint": "^2.2.0",
     "eslint-config-standard": "^5.1.0",
     "eslint-plugin-promise": "^1.3.2",
     "eslint-plugin-standard": "^1.3.2",
     "jasmine": "^2.4.1",
-    "rollup": "^0.33.0",
+    "rollup": "^0.34.12",
     "rollup-plugin-babel": "^2.6.1",
     "semantic-release": "^4.3.5"
   },

Diff for: rollup.config.js

@@ -4,7 +4,7 @@ export default {
   entry: 'index.js',
   moduleName: 'jsont',
   format: 'umd',
-  plugins: [ babel() ],
+  plugins: [babel()],
   dest: 'build/json-transforms.js',
   globals: {
     jspath: 'JSPath'