Bump async from 2.6.0 to 2.6.4

Bumps [async](https://github.com/caolan/async) from 2.6.0 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](caolan/async@v2.6.0...v2.6.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

yarn.lock

@@ -2,114 +2,28 @@
 # yarn lockfile v1
 
 
-async@^2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.0.tgz#61a29abb6fcc026fea77e56d1c6ec53a795951f4"
-  dependencies:
-    lodash "^4.14.0"
-
-core-util-is@~1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
-
-gremlin-template-string@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/gremlin-template-string/-/gremlin-template-string-2.0.0.tgz#b39639cd2ece504f29731ac097d242f0008e8188"
-
-gremlin@^2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/gremlin/-/gremlin-2.6.0.tgz#4c2c949bd7c40ff5e2bc76e42e6fc7d8788aa515"
-  dependencies:
-    gremlin-template-string "^2.0.0"
-    highland "^2.5.1"
-    lodash "^3.10.1"
-    node-uuid "^1.4.3"
-    readable-stream "^2.0.2"
-    utf8 "^2.0.0"
-    ws "^2.3.1"
-    zer "^0.1.0"
-
-highland@^2.5.1:
-  version "2.11.1"
-  resolved "https://registry.yarnpkg.com/highland/-/highland-2.11.1.tgz#39b4d9299b6e07da3d15e7af7b2a6f127522acaf"
-  dependencies:
-    util-deprecate "^1.0.2"
-
-inherits@~2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
-
-isarray@~1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
-
-lodash@^3.10.1:
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
+async-limiter@~1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
 
-lodash@^4.14.0:
-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
-
-node-uuid@^1.4.3:
-  version "1.4.8"
-  resolved "https://registry.yarnpkg.com/node-uuid/-/node-uuid-1.4.8.tgz#b040eb0923968afabf8d32fb1f17f1167fdab907"
-
-postinstall-build@^5.0.0:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/postinstall-build/-/postinstall-build-5.0.1.tgz#b917a9079b26178d9a24af5a5cd8cb4a991d11b9"
-
-process-nextick-args@~1.0.6:
-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
-
-readable-stream@^2.0.2:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.3.tgz#368f2512d79f9d46fdfc71349ae7878bbc1eb95c"
+async@^2.6.4:
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
   dependencies:
-    core-util-is "~1.0.0"
-    inherits "~2.0.3"
-    isarray "~1.0.0"
-    process-nextick-args "~1.0.6"
-    safe-buffer "~5.1.1"
-    string_decoder "~1.0.3"
-    util-deprecate "~1.0.1"
-
-safe-buffer@~5.0.1:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.0.1.tgz#d263ca54696cd8a306b5ca6551e92de57918fbe7"
+    lodash "^4.17.14"
 
-safe-buffer@~5.1.0, safe-buffer@~5.1.1:
-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.1.tgz#893312af69b2123def71f57889001671eeb2c853"
-
-string_decoder@~1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.0.3.tgz#0fc67d7c141825de94282dd536bec6b9bce860ab"
+gremlin@^3.4.13:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/gremlin/-/gremlin-3.6.0.tgz#7428bf401e9e46918c0c7d6122a3d13e6abec8c9"
   dependencies:
-    safe-buffer "~5.1.0"
-
-ultron@~1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/ultron/-/ultron-1.1.0.tgz#b07a2e6a541a815fc6a34ccd4533baec307ca864"
-
-utf8@^2.0.0:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/utf8/-/utf8-2.1.2.tgz#1fa0d9270e9be850d9b05027f63519bf46457d96"
+    ws "^6.2.2"
 
-util-deprecate@^1.0.2, util-deprecate@~1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
-
-ws@^2.3.1:
-  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-2.3.1.tgz#6b94b3e447cb6a363f785eaf94af6359e8e81c80"
-  dependencies:
-    safe-buffer "~5.0.1"
-    ultron "~1.1.0"
+lodash@^4.17.14:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
 
-zer@^0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/zer/-/zer-0.1.0.tgz#264032339ae48208bdf9a28a6b7e003db6007542"
+ws@^6.2.2:
+  version "6.2.2"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.2.2.tgz#dd5cdbd57a9979916097652d78f1cc5faea0c32e"
   dependencies:
-    postinstall-build "^5.0.0"
+    async-limiter "~1.0.0"