Update dependency rimraf to v2.6.3

Author: renovate-bot

package-lock.json

@@ -50,7 +50,7 @@
     "react": "16.6.0",
     "react-dom": "16.6.0",
     "renamer": "1.1.0",
-    "rimraf": "2.6.2",
+    "rimraf": "2.6.3",
     "rollup": "0.66.6",
     "rollup-plugin-babel": "4.0.3"
   },