.travis.yml in http-2-0.8.3 vs .travis.yml in http-2-0.8.4

@@ -2,10 +2,11 @@
 language: ruby
 rvm:
   - 2.1
   - 2.2
   - 2.3.0
-  - jruby-9.0.0.0
+  - 2.4.0
+  - jruby-9.1.8.0
   - jruby-head
   - rbx-2
 matrix:
   allow_failures:
     - rvm: jruby-head