.travis.yml in unibits-2.3.0 vs .travis.yml in unibits-2.4.0

@@ -1,16 +1,17 @@
 sudo: false
 language: ruby
 
 rvm:
 - ruby-head
+- 2.4.1
 - 2.4.0
 - 2.3.3
 - 2.2
 - 2.1
 - 2.0
 - jruby-head
-- jruby-9.1.7.0
+- jruby-9.1.8.0
 
 cache:
 - bundler
 
 matrix: