chore: use vanilla babel preset

babel-preset-es2015-rollup has been deprecated as you can now configure the
vanilla preset to exclude modules (which rollup handles).

Author: tlvince

.babelrc

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

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "angular-mocks": "^1.5.5",
     "babel-core": "^6.8.0",
-    "babel-preset-es2015-rollup": "^1.1.1",
+    "babel-preset-es2015": "^6.18.0",
     "ghooks": "^1.3.2",
     "jasmine-core": "^2.4.1",
     "karma": "^0.13.22",