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

Author: renovate-bot

package-lock.json

@@ -50,7 +50,7 @@
     "nyc": "11.9.0",
     "parcel-bundler": "1.12.3",
     "power-assert": "1.6.1",
-    "rimraf": "2.6.2",
+    "rimraf": "2.6.3",
     "typescript": "2.9.2"
   },
   "publishConfig": {