.travis.yml in rbnacl-libsodium-1.0.15.1 vs .travis.yml in rbnacl-libsodium-1.0.16

@@ -1,15 +1,13 @@
 language: ruby
 sudo: false
 
 rvm:
-  - 2.0.0
-  - 2.1.8
-  - 2.2.4
-  - 2.3.0
+  - 2.2.8
+  - 2.3.5
+  - 2.4.2
   - ruby-head
-  - jruby
-  - jruby-9.0.4.0
+  - jruby-9.1.14.0
   - jruby-head
   - rbx-2
 
 matrix:
   fast_finish: true