add 2.2 to testing

Author: steved

.travis.yml

@@ -4,6 +4,7 @@ rvm:
  - 1.9.3
  - 2.0.0
  - 2.1
+ - 2.2
  - jruby
 
 sudo: false

README.md

@@ -406,7 +406,7 @@ ZendeskAPI::AppInstallation.destroy!(client, :id => 123)
 
 ## Supported Ruby Versions
 
-Tested with Ruby 1.9, 2.0, 2.1, and jRuby.
+Tested with Ruby 1.9, 2.0, 2.1, 2.2 and jRuby.
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