Add pry to Gemfile temporarily

Author: drwl

Gemfile

@@ -17,6 +17,9 @@ end
 group :development, :test do
   gem 'byebug'
   gem 'guard-rspec', require: false
+
+  gem 'pry-byebug'
+
   gem 'rspec', require: false
 
   gem 'rubocop', '~> 0.68.1', require: false unless RUBY_VERSION =~ /^1.8/