Update flow-bin to the latest version 🚀 (#123)

## The devDependency [flow-bin](https://github.com/flowtype/flow-bin) was updated from `0.93.0` to `0.94.0`.
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.

---

[Find out more about this release](https://github.com/flowtype/flow-bin).

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

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package.json

@@ -20,7 +20,7 @@
     "conventional-changelog-cli": "^2.0.11",
     "dedent": "^0.7.0",
     "eslint": "^5.14.1",
-    "flow-bin": "^0.93.0",
+    "flow-bin": "^0.94.0",
     "flow-copy-source": "^2.0.2",
     "jest": "^24.1.0",
     "metro-react-native-babel-preset": "^0.49.1",

yarn.lock

@@ -3082,10 +3082,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.0.tgz#55122b6536ea496b4b44893ee2608141d10d9916"
   integrity sha512-R+H8IZclI8AAkSBRQJLVOsxwAoHd6WC40b4QTNWIjzAa6BXOBfQcM587MXDTVPeYaopFNWHUFLx7eNmHDSxMWg==
 
-flow-bin@^0.93.0:
-  version "0.93.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.93.0.tgz#9192a08d88db2a8da0ff55e42420f44539791430"
-  integrity sha512-p8yq4ocOlpyJgOEBEj0v0GzCP25c9WP0ilFQ8hXSbrTR7RPKuR+Whr+OitlVyp8ocdX0j1MrIwQ8x28dacy1pg==
+flow-bin@^0.94.0:
+  version "0.94.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.94.0.tgz#b5d58fe7559705b73a18229f97edfc3ab6ffffcb"
+  integrity sha512-DYF7r9CJ/AksfmmB4+q+TyLMoeQPRnqtF1Pk7KY3zgfkB/nVuA3nXyzqgsIPIvnMSiFEXQcFK4z+iPxSLckZhQ==
 
 flow-copy-source@^2.0.2:
   version "2.0.2"