Always use `raise` instead of `exit(.)`
Always use `raise` instead of `exit(.)`

Using `exit` will end the whole run, making xcode-install hard to use by other software projects. As part of using it as with fastlane.ci, we need to catch exceptions like when the user enters invalid credentials.

While the output of an exception now isn't as "pretty" (as the whole stack trace is visible), this is something that we can fix on a different level: the CLI.
KrauseFx/xcode-install,neonichu/xcode-install