chore(package): update rimraf to version 3.0.1

Closes #12

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "js-promisify": "^1.1.0",
     "mocha": "^4.0.0",
     "nyc": "^11.1.0",
-    "rimraf": "^2.6.1",
+    "rimraf": "^3.0.1",
     "webpack": "^3.5.4",
     "yaml-loader": "^0.5.0"
   }