Update @types/rsocket-core to the latest version � (#784)

Summary:
## The devDependency [types/rsocket-core](https://github.com/DefinitelyTyped/DefinitelyTyped) was updated from `0.0.3` to `0.0.4`.
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.

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

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

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<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/784

Reviewed By: cekkaewnumchai

Differential Revision: D19805486

Pulled By: passy

fbshipit-source-id: 7f5168669f571b31da81225fd6736facdc1c7cee

package.json

@@ -81,7 +81,7 @@
     "@types/react-window": "^1.8.1",
     "@types/redux-persist": "^4.3.1",
     "@types/requestidlecallback": "^0.3.1",
-    "@types/rsocket-core": "^0.0.3",
+    "@types/rsocket-core": "^0.0.4",
     "@types/testing-library__react": "^9.1.2",
     "@types/tmp": "^0.1.0",
     "@types/uuid": "^3.4.5",

yarn.lock

@@ -1574,10 +1574,10 @@
     "@types/rsocket-flowable" "*"
     "@types/rsocket-types" "*"
 
-"@types/rsocket-core@^0.0.3":
-  version "0.0.3"
-  resolved "https://registry.yarnpkg.com/@types/rsocket-core/-/rsocket-core-0.0.3.tgz#7a2d188002aaa62690fa97bd92138434e6b31cda"
-  integrity sha512-dCVQF0manLKbkcAggnafCR7Nkl5wBm3mqydcSUOA8JWeGeSp2k4aXTImhASkgFdyulB/RzGSUEIPOaJR4sB3qA==
+"@types/rsocket-core@^0.0.4":
+  version "0.0.4"
+  resolved "https://registry.yarnpkg.com/@types/rsocket-core/-/rsocket-core-0.0.4.tgz#4671edb58232e3d09bcb78c4ef62243643a00a61"
+  integrity sha512-s9WkhGvk9+DDf2oV6XdwSCm3ypEYLZt+0a8uVDosyGcysV7cD5ntIqtFleGO1UcyJXTGrt5unZJQ2z9DTGeKFA==
   dependencies:
     "@types/node" "*"
     "@types/rsocket-flowable" "*"