Update 'README.md'

README.md

@@ -15,7 +15,7 @@ Open a terminal and run the following:
 * `chsh -s /bin/bash` and enter password
 * `sudo xcodebuild -license accept` and click ok/install on developer tools
   installer popup window
-
+* `sudo xcode-select --install`
 # The Install
 
 ```bash