Upgrades flow-bin to 0.91.0 and mutes fbjs joinClasses error � (#1989)

Summary:
**Summary**

Fixes a CI build error (#1988) by adding a `$FlowExpectedError` annotation, and upgrading [flow-bin](https://www.npmjs.com/package/flow-bin) to 0.91.0

**Test Plan**

```
yarn run flow
flow src
```

```
→ flow src
The flow server's version didn't match the client's, so it exited.
Going to launch a new one.

Launching Flow server for /Users/procidac/Development/gh/claudiopro/draft-js/src
Spawned flow server (pid=87525)
Logs will go to /private/tmp/flow/zSUserszSprocidaczSDevelopmentzSghzSclaudioprozSdraft-jszSsrc.log
Monitor logs will go to /private/tmp/flow/zSUserszSprocidaczSDevelopmentzSghzSclaudioprozSdraft-jszSsrc.monitor_log
No errors!
```
Pull Request resolved: #1989

Reviewed By: pakoito

Differential Revision: D13917267

Pulled By: pakoito

fbshipit-source-id: ce66ee4c67c4e7cc46c51ca91a4ade3d980fdf2e

Author: Claudio Procida

meta/bundle-size-stats/Draft.js.json

@@ -58,7 +58,7 @@
     "eslint-plugin-react": "^7.3.0",
     "eslint-plugin-relay": "^0.0.8",
     "fbjs-scripts": "^0.8.0",
-    "flow-bin": "^0.70.0",
+    "flow-bin": "^0.92.0",
     "gulp": "^4.0.0",
     "gulp-babel": "^6.1.2",
     "gulp-browserify-thin": "^0.1.5",

meta/bundle-size-stats/Draft.min.js.json

@@ -33,7 +33,8 @@ module.system.haste.paths.blacklist=.*/node_modules/invariant/.*
 esproposal.class_static_fields=enable
 suppress_type=$FlowIssue
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(2[0-8]\\|1[0-9]\\|[0-9]\\).[0-9]\\)? *\\).*\n
+suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 module.name_mapper='ReactDOM' -> 'react-dom'
 
 [version]
-^0.70.0
+^0.92.0

package.json

@@ -197,6 +197,7 @@ class DraftEditorContents extends React.Component<Props> {
           lastWrapperTemplate !== wrapperTemplate ||
           currentDepth === null ||
           depth > currentDepth;
+        // $FlowExpectedError joinClasses args in [email protected] are incorrect
         className = joinClasses(
           className,
           getListItemClasses(blockType, depth, shouldResetCount, direction),

src/.flowconfig

@@ -2619,10 +2619,10 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@^0.70.0:
-  version "0.70.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.70.0.tgz#080ae83a997f2b4ddb3dc2649bf13336825292b5"
-  integrity sha1-CAroOpl/K03bPcJkm/EzNoJSkrU=
+flow-bin@^0.92.0:
+  version "0.92.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.92.0.tgz#f5bf3e808b17b480e067ac673829ca715a168bea"
+  integrity sha512-3ErXSAXZZlLV5/QPlaUDCWlDUXop1SiH32ifXL3SEiBwsmGbudCLim+HFVZfkegrn1nB4TcNSkMWtW8SnMPyAQ==
 
 flush-write-stream@^1.0.0:
   version "1.0.2"