chore(package): update rollup-plugin-babel-minify to version 7.0.0

Closes #32

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
   "devDependencies": {
     "bundlesize": "^0.17.0",
     "rollup": "^0.64.1",
-    "rollup-plugin-babel-minify": "^5.0.0",
+    "rollup-plugin-babel-minify": "^7.0.0",
     "rollup-plugin-commonjs": "^9.0.0",
     "rollup-plugin-node-resolve": "^3.0.3",
     "rollup-plugin-replace": "^2.0.0",