Bump async from 2.6.3 to 3.2.2

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 3.2.2.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.6.3...v3.2.2)

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

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

package.json

@@ -80,7 +80,7 @@
     "@svgr/webpack": "4.1.0",
     "@trailofbits/embark-contract-info": "^1.1.0",
     "apollo-boost": "^0.4.3",
-    "async": "^2.4.0",
+    "async": "^3.2.2",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "9.0.0",
     "babel-jest": "23.6.0",

yarn.lock

@@ -3135,6 +3135,11 @@ async@^2.0.1, async@^2.1.2, async@^2.1.4, async@^2.4.0, async@^2.5.0, async@^2.6
   dependencies:
     lodash "^4.17.14"
 
+async@^3.2.2:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/async/-/async-3.2.2.tgz#2eb7671034bb2194d45d30e31e24ec7e7f9670cd"
+  integrity sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g==
+
 asynckit@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"