fix: allow adoptopenjdk8 brew installation

Prevent brew error :

```bash
Error: Cask adoptopenjdk8 exists in multiple taps:
  homebrew/cask-versions/adoptopenjdk8
  caskroom/versions/adoptopenjdk8
```

Author: qkdreyer

native-script.rb

@@ -118,7 +118,7 @@ def install_environment_variable(name, value)
 end
 
 # Allow brew to lookup versions
-execute("brew tap caskroom/versions", "", false)
+execute("brew tap homebrew/homebrew-cask-versions", "", false)
 
 # Install Google Chrome
 install("Google Chrome", "Installing Google Chrome (required to debug NativeScript apps)", "brew cask install google-chrome", false, false);