Bump async from 2.6.1 to 3.1.0

Bumps [async](https://github.com/caolan/async) from 2.6.1 to 3.1.0.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](caolan/async@v2.6.1...v3.1.0)

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

package.json

@@ -22,7 +22,7 @@
     "mongodb-js-precommit": "bin/mongodb-js-precommit.js"
   },
   "dependencies": {
-    "async": "^2.6.1",
+    "async": "^3.1.0",
     "chalk": "^3.0.0",
     "debug": "^4.1.1",
     "dependency-check": "^4.1.0",