Switch from byebug to debug.rb

To get jruby compatibility

Author: alexdunae

spec/spec_helper.rb

@@ -1,7 +1,6 @@
 require "active_model"
 require "active_support"
-require "pry"
-require "byebug"
+require "debug"
 
 RSpec::Matchers.define :have_errors_on_email do
   match do |user|

validates_email_format_of.gemspec

@@ -25,5 +25,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rspec"
   s.add_development_dependency "standard"
   s.add_development_dependency "appraisal"
-  s.add_development_dependency "pry-byebug"
+  s.add_development_dependency "byebug", ">= 1.0.0"
 end