chore(package): update @babel/core to version 7.3.3

Closes #6

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "@babel/core": "7.1.5",
+    "@babel/core": "7.3.3",
     "@babel/plugin-proposal-class-properties": "7.1.0",
     "@babel/plugin-proposal-decorators": "7.1.2",
     "@babel/plugin-proposal-export-namespace-from": "7.0.0",