-auto-gen-config and --rails are order sensitive

[agrimm]

I can do

bundle exec rubocop --rails --auto-gen-config

but not

bundle exec rubocop --auto-gen-config --rails

getting the error message

--auto-gen-config can only be combined with --exclude-limit.

There may be a good reason to only allow --rails before --auto-gen-config, rather than afterwards, but as it's currently written, people may think that it's just not possible to use --rails at all.

[jonas054]

I think I was the one who added the validation for --auto-gen-config a long time ago, and I obviously made a mistake. This might be a good opportunity to improve it and not be more strict that we need to. What's wrong with combining --auto-gen-config with other options really? How about assuming that people know what they're doing instead?