Merge pull request #27 from Halceyon/greenkeeper/rollup-plugin-babel-4.3.3

Update rollup-plugin-babel to the latest version 🚀

Author: Halceyon

package-lock.json

@@ -55,7 +55,7 @@
     "mocha-lcov-reporter": "^1.3.0",
     "parse-json": "^4.0.0",
     "rollup": "^1.12.0",
-    "rollup-plugin-babel": "^3.0.3",
+    "rollup-plugin-babel": "^4.3.3",
     "semantic-release": "^15.13.13",
     "sinon": "^6.0.0",
     "sinon-stub-promise": "^4.0.0",