chore(package): update rimraf to version 2.6.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "pre-commit": "^1.2.2",
     "pull-generate": "^2.2.0",
     "pull-zip": "^2.0.1",
-    "rimraf": "^2.5.4"
+    "rimraf": "^2.6.1"
   },
   "dependencies": {
     "async": "^2.1.4",