Update ws in group main to the latest version � (#595)

Summary:
## The dependency [ws](https://github.com/websockets/ws) was updated from `7.1.2` to `7.2.0`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

 ---

**Publisher:** [lpinca](https://www.npmjs.com/~lpinca)
**License:** MIT

[Find out more about this release](https://github.com/websockets/ws).

 ---

<details>
  <summary>FAQ and help</summary>

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/595

Reviewed By: jknoxville

Differential Revision: D18036025

Pulled By: passy

fbshipit-source-id: fc897470cbd05fb6605a7816fc8bd72476192957

package.json

@@ -170,7 +170,7 @@
     "uuid": "^3.3.2",
     "websocket": "^1.0.24",
     "which": "^2.0.1",
-    "ws": "7.1.2",
+    "ws": "7.2.0",
     "xdg-basedir": "^4.0.0",
     "xml2js": "^0.4.19",
     "yargs": "^14.2.0",

yarn.lock

@@ -9640,10 +9640,10 @@ ws@7.1.0:
   dependencies:
     async-limiter "^1.0.0"
 
-ws@7.1.2, ws@^7:
-  version "7.1.2"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-7.1.2.tgz#c672d1629de8bb27a9699eb599be47aeeedd8f73"
-  integrity sha512-gftXq3XI81cJCgkUiAVixA0raD9IVmXqsylCrjRygw4+UOOGzPoxnQ6r/CnVL9i+mDncJo94tSkyrtuuQVBmrg==
+ws@7.2.0:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.2.0.tgz#422eda8c02a4b5dba7744ba66eebbd84bcef0ec7"
+  integrity sha512-+SqNqFbwTm/0DC18KYzIsMTnEWpLwJsiasW/O17la4iDRRIO9uaHbvKiAS3AHgTiuuWerK/brj4O6MYZkei9xg==
   dependencies:
     async-limiter "^1.0.0"
 
@@ -9654,6 +9654,13 @@ ws@^5.2.0:
   dependencies:
     async-limiter "~1.0.0"
 
+ws@^7:
+  version "7.1.2"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.1.2.tgz#c672d1629de8bb27a9699eb599be47aeeedd8f73"
+  integrity sha512-gftXq3XI81cJCgkUiAVixA0raD9IVmXqsylCrjRygw4+UOOGzPoxnQ6r/CnVL9i+mDncJo94tSkyrtuuQVBmrg==
+  dependencies:
+    async-limiter "^1.0.0"
+
 ws@~6.1.0:
   version "6.1.4"
   resolved "https://registry.yarnpkg.com/ws/-/ws-6.1.4.tgz#5b5c8800afab925e94ccb29d153c8d02c1776ef9"