Update babel7 to the latest version 🚀 (#20)

* chore(package): update @babel/cli to version 7.1.0
* chore(package): update @babel/core to version 7.1.0
* chore(package): update @babel/preset-env to version 7.1.0

Author: greenkeeper[bot]

package.json

@@ -84,10 +84,10 @@
     "babel-loader": "8.0.x",
     "source-map-loader": "0.2.x",
     "copy-webpack-plugin": "4.5.x",
-    "@babel/cli": "7.0.x",
-    "@babel/core": "7.0.x",
+    "@babel/cli": "~7.1.0",
+    "@babel/core": "~7.1.0",
     "@babel/register": "7.0.x",
-    "@babel/preset-env": "7.0.x",
+    "@babel/preset-env": "~7.1.0",
     "@babel/plugin-syntax-object-rest-spread": "7.0.x",
     "mocha": "5.x",
     "mocha-junit-reporter": "1.18.x",