.travis.yml in arc-furnace-0.1.23 vs .travis.yml in arc-furnace-0.1.24

@@ -1,6 +1,7 @@
 language: ruby
 sudo: false
 rvm:
-  - 2.1.6
   - 2.2.3
-  - jruby-9000
\ No newline at end of file
+  - 2.3.3
+  - 2.4.0
+