clean up dead files, bump minimum ruby to 2.2.2

Author: lostapathy

.travis.yml

@@ -19,4 +19,4 @@ before_script:
 script:
   - bundle exec rake spec:ci
   - bundle exec rake spec:api
-  - bundle exec rake spec:testrunner
+  - bundle exec rake spec:testrunner

README.md

@@ -7,7 +7,7 @@
 
 
 ## Requirements
-* Ruby 2.2 or higher
+* Ruby 2.2.2 or higher
 * RubyGem 1.3.7 or higher (to build the gem)
 * RDoc 1.0 or higher (to build documentation)
 * Rake 0.8.7 or higher (to use the rake tasks)

authorizenet.gemspec

@@ -11,7 +11,7 @@ Gem::Specification.new do |s|
   s.homepage = "https://github.com/AuthorizeNet/sdk-ruby"
   s.license = "https://github.com/AuthorizeNet/sdk-ruby/blob/master/LICENSE.txt"
 
-  s.required_ruby_version     = '>= 2.1.0'
+  s.required_ruby_version     = '>= 2.2.2'
   s.required_rubygems_version = '>= 1.3.6'
 
   s.add_runtime_dependency 'activesupport', '>= 4.2.6'