chore(package): update babel-plugin-transform-runtime to version 6.12.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -16,7 +16,7 @@
     "babel-plugin-transform-class-properties": "6.11.5",
     "babel-plugin-transform-object-rest-spread": "6.8.0",
     "babel-plugin-transform-proto-to-assign": "6.9.0",
-    "babel-plugin-transform-runtime": "6.9.0",
+    "babel-plugin-transform-runtime": "6.12.0",
     "babel-preset-es2015": "6.9.0",
     "babel-preset-es2015-loose": "7.0.0",
     "babel-preset-react": "6.11.1",