chore(package): update rimraf to version 2.5.4 (#290)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -60,7 +60,7 @@
     "nodemon": "1.9.2",
     "nyc": "6.6.1",
     "proxyquire": "1.7.10",
-    "rimraf": "2.5.2",
+    "rimraf": "2.5.4",
     "semantic-release": "4.3.5",
     "semver": "5.3.0",
     "sinon": "1.17.3"