Bump async from 2.1.5 to 3.2.6

Bumps [async](https://github.com/caolan/async) from 2.1.5 to 3.2.6.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](caolan/async@v2.1.5...v3.2.6)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -21,7 +21,7 @@
     "JSONStream": "^1.0.0",
     "agentkeepalive": "^4.1.3",
     "ajv": "6.12.2",
-    "async": "~2.1.5",
+    "async": "~3.2.6",
     "debug": "~2.6.9",
     "diskusage": "^1.1.1",
     "ioredis": "4.9.5",

yarn.lock

@@ -233,12 +233,10 @@ async-limiter@~1.0.0:
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
   integrity sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==
 
-async@~2.1.5:
-  version "2.1.5"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.1.5.tgz#e587c68580994ac67fc56ff86d3ac56bdbe810bc"
-  integrity sha1-5YfGhYCZSsZ/xW/4bTrFa9voELw=
-  dependencies:
-    lodash "^4.14.0"
+async@~3.2.6:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/async/-/async-3.2.6.tgz#1b0728e14929d51b85b449b7f06e27c1145e38ce"
+  integrity sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==
 
 backo2@1.0.2:
   version "1.0.2"
@@ -1709,7 +1707,7 @@ lodash.union@^4.6.0:
   resolved "https://registry.yarnpkg.com/lodash.union/-/lodash.union-4.6.0.tgz#48bb5088409f16f1821666641c44dd1aaae3cd88"
   integrity sha1-SLtQiECfFvGCFmZkHETdGqrjzYg=
 
-lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.15, lodash@^4.3.0:
+lodash@^4.0.0, lodash@^4.17.15, lodash@^4.3.0:
   version "4.17.21"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
   integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==