chore(package): update @babel/core to version 7.2.2

Closes #6

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "url-search-params": "^1.1.0"
   },
   "devDependencies": {
-    "@babel/core": "7.1.5",
+    "@babel/core": "7.2.2",
     "@babel/plugin-proposal-class-properties": "7.1.0",
     "@babel/plugin-proposal-decorators": "7.1.2",
     "@babel/plugin-proposal-export-namespace-from": "7.0.0",