chore(deps): update dependency rimraf to v2.6.3

Author: renovate-bot

package-lock.json

@@ -49,7 +49,7 @@
     "mocha": "5.2.0",
     "nyc": "11.9.0",
     "power-assert": "1.6.1",
-    "rimraf": "2.6.2",
+    "rimraf": "2.6.3",
     "source-map-support": "0.5.12"
   },
   "publishConfig": {