.travis.yml in unibits-2.6.0 vs .travis.yml in unibits-2.7.0

@@ -1,25 +1,22 @@
 sudo: false
 language: ruby
 
 rvm:
 - ruby-head
-- 2.4.1
-- 2.4.0
-- 2.3.4
-- 2.3.3
-- 2.2.7
-- 2.2.6
+- 2.5.1
+- 2.4.4
+- 2.3.7
+- 2.2.9
 - 2.1
 - 2.0
 - jruby-head
-- jruby-9.1.8.0
+- jruby-9.1.16.0
 
-cache:
-- bundler
-
 matrix:
   allow_failures:
     - rvm: jruby-head
     - rvm: ruby-head
     - rvm: 2.0
+    - rvm: 2.1
+    - rvm: 2.2
 #   fast_finish: true