Update dependency rimraf to v2.6.3

Author: renovate-bot

package.json

@@ -44,7 +44,7 @@
     "babel-plugin-transform-regenerator": "6.26.0",
     "babel-preset-es2015": "6.24.1",
     "eslint": "4.19.1",
-    "rimraf": "2.6.2"
+    "rimraf": "2.6.3"
   },
   "eslintConfig": {
     "parser": "babel-eslint",