[travis-ci] excluded too much - run the other rubies as well (not just jruby)

Author: kares

.travis.yml

@@ -12,23 +12,13 @@ jdk: # for JRuby only
   - oraclejdk8
 matrix:
   exclude:
-    - rvm: rbx-2
-      jdk: openjdk7
     - rvm: rbx-2
       jdk: oraclejdk8
-    - rvm: 1.8.7
-      jdk: openjdk7
     - rvm: 1.8.7
       jdk: oraclejdk8
-    - rvm: 1.9.3
-      jdk: openjdk7
     - rvm: 1.9.3
       jdk: oraclejdk8
-    - rvm: 2.0.0
-      jdk: openjdk7
     - rvm: 2.0.0
       jdk: oraclejdk8
-    - rvm: 2.1.0
-      jdk: openjdk7
     - rvm: 2.1.0
       jdk: oraclejdk8