.travis.yml in omniauth-1.3.1 vs .travis.yml in omniauth-1.3.2

@@ -1,33 +1,25 @@
 bundler_args: --without development
-before_install: gem install bundler
+before_install: gem update bundler
 cache: bundler
 env:
   global:
     - JRUBY_OPTS="$JRUBY_OPTS --debug"
-gemfile:
-  - Gemfile
-  - Gemfile.rack-1.3.x
 language: ruby
 rvm:
-  - jruby-18mode
   - jruby-19mode
   - jruby-9000
   - 1.8.7
   - 1.9.3
   - 2.0.0
-  - 2.1
-  - 2.2
+  - 2.1.10
+  - 2.2.5
+  - 2.3.3
+  - 2.4.0
   - jruby-head
-  - rbx-2
   - ruby-head
 matrix:
-  include:
-    - rvm: 2.2.2
-      gemfile: Gemfile.rack-master
   allow_failures:
     - rvm: jruby-head
-    - rvm: rbx-2
     - rvm: ruby-head
-    - gemfile: Gemfile.rack-master
   fast_finish: true
 sudo: false