.travis.yml in rbnacl-3.4.0 vs .travis.yml in rbnacl-4.0.0.pre

@@ -1,33 +1,24 @@
 language: ruby
 sudo: false
+cache: bundler
 script: bundle exec rake ci
+bundler_args: --without development
+
 branches:
   only:
     - master
 
-bundler_args: --without development
-
 rvm:
-  - 2.0.0
-  - 2.1.10
-  - 2.2.5
-  - 2.3.1
-  - ruby-head
-  - jruby
-  - jruby-9.0.5.0
-  - jruby-head
-  - rbx-2
+  - jruby-9.1.6.0
+  - 2.2.6
+  - 2.3.3
 
 env:
-  - LIBSODIUM_VERSION=1.0.0 # Minimum supported
-  - LIBSODIUM_VERSION=1.0.8 # Latest released
+  - LIBSODIUM_VERSION=1.0.0  # Minimum supported
+  - LIBSODIUM_VERSION=1.0.11 # Latest released
 
 matrix:
   fast_finish: true
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: rbx-2
 
 notifications:
   irc: "irc.freenode.org#cryptosphere"