Remove unused Rubocop exception
Remove unused Rubocop exception

This exception was causing a warning:

`.rubocop.yml: Style/ConstantName has the wrong namespace - should be Naming`

Since we don't use EveryPolitician (it's Everypolitician) there was no
point in having it (any more?) so it's safe to remove entirely.

everypolitician/everypolitician-ruby,everypolitician/everypolitician-ruby