Update travis build matrix.

ioquatix · ioquatix · commit 22832a5aff1f · 2020-03-31T00:32:10.000+13:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,16 +6,13 @@ script: bundle exec rspec
 
 matrix:
   include:
-    - rvm: 2.3
-    - rvm: 2.4
     - rvm: 2.5
     - rvm: 2.6
     - rvm: 2.7
     - rvm: jruby-head
       env: JRUBY_OPTS="--debug -X+O"
+    - rvm: truffleruby
     - rvm: ruby-head
-    - rvm: rbx-3
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx-3
