Generate a rubocop todo

[hennevogel]

We don't have a Gemfile.lock and only loosely specify the rubocop version in our gemspec, so we get new rubocop versions in CI all the time...

[hennevogel]

See all the other failing PRs before this...

[dmarcoux]

What speaks against pinning a specific version of RuboCop as a development dependency? This would ensure we have a reproducible CI.

[hennevogel]

What speaks against pinning a specific version of RuboCop as a development dependency?

Bitrot? :)

[dmarcoux]

After sleeping on it, I think this is at least a step in the right direction. It does mean that we need to regenerate the RuboCop TODOs whenever there's a new RuboCop version.

If we end up pinning RuboCop, we can always do it in another PR.