Include 2.5 and 2.6 travis testing.

ioquatix · ioquatix · commit ceb852465e86 · 2018-11-07T00:18:18.000+13:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,8 @@ matrix:
   include:
     - rvm: 2.3
     - rvm: 2.4
+    - rvm: 2.5
+    - rvm: 2.6
     - rvm: jruby-head
       env: JRUBY_OPTS="--debug -X+O"
     - rvm: ruby-head
