.travis.yml in mongoid-locker-0.2.1 vs .travis.yml in mongoid-locker-0.3.0

@@ -1,24 +1,16 @@
 language: ruby
+
 rvm:
-  - 1.8.7
-  - 1.9.2
   - 1.9.3
-  - jruby-18mode # JRuby in 1.8 mode
-  - jruby-19mode # JRuby in 1.9 mode
-  - rbx-18mode
-  - rbx-19mode
+  - 2.1.2
+  - jruby-19mode
+  - rbx-2
+
 services: mongodb
-gemfile:
-  - gemfiles/mongoid2.gemfile
-  - gemfiles/mongoid3.gemfile
-matrix:
-  exclude:
-    # not supported by Mongoid 3
-    - rvm: 1.8.7
-      gemfile: gemfiles/mongoid3.gemfile
-    - rvm: 1.9.2
-      gemfile: gemfiles/mongoid3.gemfile
-    - rvm: jruby-18mode
-      gemfile: gemfiles/mongoid3.gemfile
-    - rvm: rbx-18mode
-      gemfile: gemfiles/mongoid3.gemfile
+
+env:
+  - MONGOID_VERSION=2
+  - MONGOID_VERSION=3
+  - MONGOID_VERSION=4
+
+cache: bundler