Lock rest-client to ~> 1.6.0 on Ruby 1.8.7

.travis.yml

@@ -1,7 +1,6 @@
 language: ruby
 rvm:
   - 1.8.7
-  - 1.9.2
   - 1.9.3
   - 2.0.0
   - 2.1

Gemfile

@@ -7,8 +7,9 @@ group :test do
   gem 'backports'
   gem 'coveralls', :require => false
   gem 'mime-types', '~> 1.25', :platforms => [:jruby, :ruby_18]
+  gem 'rest-client', '~> 1.6.0', :platforms => [:jruby, :ruby_18]
   gem 'rspec', '>= 2.14'
-  gem 'rubocop', '>= 0.23', :platforms => [:ruby_19, :ruby_20, :ruby_21]
+  gem 'rubocop', '>= 0.25', :platforms => [:ruby_19, :ruby_20, :ruby_21]
   gem 'simplecov', :require => false
   gem 'yardstick'
 end

README.md

@@ -20,7 +20,6 @@ against](http://travis-ci.org/laserlemon/simple_oauth) the following Ruby
 implementations:
 
 * Ruby 1.8.7
-* Ruby 1.9.2
 * Ruby 1.9.3
 * Ruby 2.0.0
 * Ruby 2.1