Don't test on obsolete rubies

.travis.yml

@@ -15,8 +15,6 @@ rvm:
   - 2.5.1
   - 2.4.4
   - 2.3.7
-  - 2.2.10
-  - 2.1.10
   - jruby-9.1.16.0
 gemfile:
   - Gemfile
@@ -32,18 +30,12 @@ addons:
 
 matrix:
   include:
-    - rvm: 1.9.3
-      gemfile: gemfiles/Gemfile.1_9_3
-    - rvm: jruby-19mode
-      gemfile: gemfiles/Gemfile.1_9_3
-    - rvm: 2.0.0
-      gemfile: gemfiles/Gemfile.2_0_0
     - rvm: 2.5.1
       gemfile: gemfiles/Gemfile.capy2
-    - rvm: 2.2.9
+    - rvm: 2.3.7
       gemfile: Gemfile
       env: PHANTOMJS=$PWD/travis-phantomjs2/phantomjs
-    - rvm: 2.3.6
+    - rvm: 2.5.1
       gemfile: gemfiles/Gemfile.capybara_master
   allow_failures:
     - gemfile: gemfiles/Gemfile.capybara_master

gemfiles/Gemfile.1_9_3

@@ -1,16 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec path: '..'
-
-gem 'capybara', '~>2.1'
-gem 'mime-types', '< 3.0'
-gem 'addressable', '< 2.5.0' # 2.5 requires public_suffix which requires ruby 2.0
-
-platforms :rbx do
-  gem 'rubysl'
-  gem 'racc'
-  gem 'json'
-end
-
-gem 'nokogiri', '< 1.7.0' # 1.7.0 requires ruby 2.1+
-gem 'ttfunk', '<1.5.0' #1.5.0 requires ruby 2.1+

gemfiles/Gemfile.2_0_0

@@ -1,14 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec path: '..'
-
-gem 'capybara', '~>2.1'
-
-platforms :rbx do
-  gem 'rubysl'
-  gem 'racc'
-  gem 'json'
-end
-
-gem 'nokogiri', '< 1.7.0' # 1.7.0 requires ruby 2.1+
-gem 'ttfunk', '<1.5.0' #1.5.0 requires ruby 2.1+