Remove pry-byebug
Remove pry-byebug

Byebug currently requires Ruby 2.4+ and this broke the
build on the bundle step. I've decide to remove it rather than pin it
to an older version as I don't think it's an essential dev
dependency.

jfelchner/rubocop,vergenzt/rubocop,meganemura/rubocop,deivid-rodriguez/rubocop,mikegee/rubocop,tdeo/rubocop,rrosenblum/rubocop,tejasbubane/rubocop,bbatsov/rubocop,jfelchner/rubocop,tejasbubane/rubocop,jmks/rubocop,mikegee/rubocop,meganemura/rubocop,meganemura/rubocop,vergenzt/rubocop,bbatsov/rubocop,deivid-rodriguez/rubocop,maxjacobson/rubocop,smakagon/rubocop,panthomakos/rubocop,tdeo/rubocop,tejasbubane/rubocop,jfelchner/rubocop,maxjacobson/rubocop,jmks/rubocop,mikegee/rubocop,panthomakos/rubocop,deivid-rodriguez/rubocop,panthomakos/rubocop,rrosenblum/rubocop,tdeo/rubocop,maxjacobson/rubocop,vergenzt/rubocop,smakagon/rubocop,jmks/rubocop,rrosenblum/rubocop