chore: Update flow-bin to the latest version 🚀 (#75)

## The devDependency [flow-bin](https://github.com/flowtype/flow-bin) was updated from `0.86.0` to `0.87.0`.
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>

  There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>

---


Your [Greenkeeper](https://greenkeeper.io) bot 🌴

.flowconfig

@@ -69,4 +69,4 @@ include_warnings=true
 .*/Libraries/YellowBox/UI/YellowBoxList.js
 
 [version]
-^0.86.0
+^0.87.0

package.json

@@ -21,7 +21,7 @@
     "conventional-changelog-cli": "^2.0.11",
     "dedent": "^0.7.0",
     "eslint": "^5.6.1",
-    "flow-bin": "^0.86.0",
+    "flow-bin": "^0.87.0",
     "flow-copy-source": "^2.0.2",
     "jest": "^23.6.0",
     "metro-react-native-babel-preset": "^0.49.0",

yarn.lock

@@ -3168,9 +3168,10 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@^0.86.0:
-  version "0.86.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.86.0.tgz#153a28722b4dc13b7200c74b644dd4d9f4969a11"
+flow-bin@^0.87.0:
+  version "0.87.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.87.0.tgz#fab7f984d8cc767e93fa9eb01cf7d57ed744f19d"
+  integrity sha512-mnvBXXZkUp4y6A96bR5BHa3q1ioIIN2L10w5osxJqagAakTXFYZwjl0t9cT3y2aCEf1wnK6n91xgYypQS/Dqbw==
 
 flow-copy-source@^2.0.2:
   version "2.0.2"