Use Xcode_10.2.1
Use Xcode_10.2.1

`brew doctor` will return exit code 1 if using Xcode_10.2

```==> brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Your Xcode (10.2) is outdated.
Please update to Xcode 10.2.1 (or delete it).
Xcode can be updated from the App Store.

==> FAILED
```
vitorgalvao/brew,MikeMcQuaid/brew,EricFromCanada/brew,konqui/brew,reitermarkus/brew,reitermarkus/brew,Homebrew/brew,JCount/brew,mahori/brew,nandub/brew,EricFromCanada/brew,vitorgalvao/brew,JCount/brew,nandub/brew,nandub/brew,konqui/brew,Homebrew/brew,mahori/brew,sjackman/homebrew,vitorgalvao/brew,MikeMcQuaid/brew,Homebrew/brew,claui/brew,vitorgalvao/brew,reitermarkus/brew,mahori/brew,EricFromCanada/brew,MikeMcQuaid/brew,claui/brew,sjackman/homebrew,nandub/brew,MikeMcQuaid/brew,claui/brew,sjackman/homebrew,JCount/brew,konqui/brew,reitermarkus/brew,JCount/brew,sjackman/homebrew,Homebrew/brew,EricFromCanada/brew,mahori/brew,claui/brew,konqui/brew