Update dependency walk-sync to v2.0.2

Author: renovate-bot

package.json

@@ -124,7 +124,7 @@
     "testem": "2.16.0",
     "top-gh-contribs": "2.0.4",
     "validator": "7.2.0",
-    "walk-sync": "2.0.1"
+    "walk-sync": "2.0.2"
   },
   "ember-addon": {
     "paths": [