Update babel7 to the latest version 🚀 (#286)

* chore(package): update @babel/core to version 7.0.0-rc.1

* chore(package): update @babel/plugin-proposal-class-properties to version 7.0.0-rc.1

* chore(package): update @babel/plugin-syntax-object-rest-spread to version 7.0.0-rc.1

* chore(package): update @babel/plugin-transform-flow-comments to version 7.0.0-rc.1

* chore(package): update @babel/plugin-transform-modules-commonjs to version 7.0.0-rc.1

* chore(package): update @babel/register to version 7.0.0-rc.1

Author: greenkeeper[bot]

package.json

@@ -29,12 +29,12 @@
     "transliteration": "^1.6.2"
   },
   "devDependencies": {
-    "@babel/core": "7.0.0-beta.54",
-    "@babel/plugin-proposal-class-properties": "7.0.0-beta.54",
-    "@babel/plugin-syntax-object-rest-spread": "7.0.0-beta.54",
-    "@babel/plugin-transform-flow-comments": "7.0.0-beta.54",
-    "@babel/plugin-transform-modules-commonjs": "7.0.0-beta.54",
-    "@babel/register": "7.0.0-beta.54",
+    "@babel/core": "7.0.0-rc.1",
+    "@babel/plugin-proposal-class-properties": "7.0.0-rc.1",
+    "@babel/plugin-syntax-object-rest-spread": "7.0.0-rc.1",
+    "@babel/plugin-transform-flow-comments": "7.0.0-rc.1",
+    "@babel/plugin-transform-modules-commonjs": "7.0.0-rc.1",
+    "@babel/register": "7.0.0-rc.1",
     "babel-eslint": "^8.2.1",
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",