chore(package): update rimraf to version 3.0.0

Closes #112

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "ava": "0.25.0",
     "np": "3.0.2",
-    "rimraf": "2.6.2",
+    "rimraf": "3.0.0",
     "snazzy": "8.0.0",
     "standard": "12.0.1",
     "vfile": "2.3.0",