travis; update set of rubies to test against

Author: zimbatm

.travis.yml

@@ -1,19 +1,15 @@
 language: ruby
 sudo: false
 rvm:
-  - 1.9.2
   - 1.9.3
-  - 2.0.0
+  - 2.0
   - 2.1
   - 2.2
   - 2.3.0
-  - jruby-18mode
-  - jruby-19mode
+  - jruby
   - rbx-2
 
 matrix:
   allow_failures:
-    - rmv: 1.9.2
-    - rvm: jruby-18mode
-    - rvm: jruby-19mode
+    - rvm: jruby
     - rvm: rbx-2