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.
rubocop · Apr 30, 2019 · a242d4a · a242d4a
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commit a242d4a
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diff --git a/Gemfile b/Gemfile
@@ -6,7 +6,6 @@ gemspec
 
 gem 'bump', require: false
 gem 'pry'
-gem 'pry-byebug' if RUBY_ENGINE == 'ruby'
 gem 'rake', '~> 12.0'
 gem 'rspec', '~> 3.7'
 gem 'rubocop-performance', '~> 1.1.0'