update rubocop and add a todo file

[mejackreed]

Resolves a vulnerability in older versions of Rubocop

[eliotjordan]

I reworked this with a commit to use the bixby gem to manage rubocop. It's stable, community supported, and offers sensible defaults.

[coveralls]

Coverage remained the same at 96.062% when pulling addfdcf on update-rubocop into 8fa62b7 on master.

[eliotjordan]

@mejackreed Any thoughts on this? I can go back to a straight rubocop solution if that feels better. We should do something, though, as the current setup has that security vulnerability and I'm getting errors related to rspec (we're missing require: rubocop-rspec in the settings file):

Warning: unrecognized cop RSpec/FilePath found in /Users/eliotj/Documents/Repositories/geoblacklight/.rubocop.yml
Warning: unrecognized cop RSpec/DescribeClass found in /Users/eliotj/Documents/Repositories/geoblacklight/.rubocop.yml
Warning: unrecognized cop RSpec/AnyInstance found in /Users/eliotj/Documents/Repositories/geoblacklight/.rubocop.yml

[mejackreed]

No strong feelings really. As long as it works and people are 🆗 with it, i'm good. I don't ever use bixby for anything so defer to your experience here.