Bump walk-sync from 0.3.3 to 1.0.0 (ember-learn#308)

Bumps [walk-sync](https://github.com/joliss/node-walk-sync) from 0.3.3 to 1.0.0.
- [Release notes](https://github.com/joliss/node-walk-sync/releases)
- [Changelog](https://github.com/joliss/node-walk-sync/blob/master/CHANGELOG.md)
- [Commits](joliss/node-walk-sync@v0.3.3...v1.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -34,6 +34,6 @@
     "mocha": "^5.0.0",
     "np": "*",
     "require-directory": "^2.1.1",
-    "walk-sync": "^0.3.2"
+    "walk-sync": "^1.0.0"
   }
 }