Bump async from 2.6.3 to 3.2.0 (#314)

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 3.2.0.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](caolan/async@v2.6.3...v3.2.0)

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package.json

@@ -49,7 +49,7 @@
     "temp": "^0.8.0"
   },
   "dependencies": {
-    "async": "^2.6.3",
+    "async": "^3.2.0",
     "bignumber.js": "^8.0.2",
     "debug": "^4.1.1",
     "lodash": "^4.17.15",