Don't require pry by default

Gemfile

@@ -3,7 +3,7 @@ ruby '~> 2.6.0'
 
 gem 'rake'
 gem 'thor'
-gem 'pry', '~> 0.12.0'
+gem 'pry', '~> 0.12.0', require: false
 gem 'activesupport', '~> 5.2', require: false
 gem 'yajl-ruby', require: false
 gem 'html-pipeline'