Bump async from 2.6.1 to 3.2.2 (#113)

Bumps [async](https://github.com/caolan/async) from 2.6.1 to 3.2.2.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](caolan/async@v2.6.1...v3.2.2)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
     "test": "grunt test"
   },
   "dependencies": {
-    "async": "^2.6.1",
+    "async": "^3.2.2",
     "rimraf": "^2.6.2"
   },
   "devDependencies": {