Remove Pry and Guard development dependencies.

Author: hainesr

Guardfile

@@ -33,10 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'ffi', '~> 1.0'
   spec.add_dependency 'rubyzip', '~> 2.2'
 
-  spec.add_development_dependency 'guard'
-  spec.add_development_dependency 'guard-minitest'
   spec.add_development_dependency 'minitest', '~> 5.4'
-  spec.add_development_dependency 'pry', '~> 0.10'
   spec.add_development_dependency 'rake', '~> 13.2'
   spec.add_development_dependency 'rubocop', '~> 0.79.0'
   spec.add_development_dependency 'simplecov', '~> 0.18.0'