chore(package): update rimraf to version 2.7.0

Closes #181

Author: greenkeeper[bot]

package.json

@@ -116,7 +116,7 @@
     "nsp": "3.1.0",
     "nyc": "11.3.0",
     "phantomjs-prebuilt": "2.1.16",
-    "rimraf": "2.6.2",
+    "rimraf": "2.7.0",
     "rollup": "0.50.0",
     "rollup-plugin-babel": "3.0.2",
     "rollup-plugin-cleanup": "2.0.0",