.travis.yml in pickle-0.5.3 vs .travis.yml in pickle-0.5.4

@@ -1,10 +1,17 @@
 language: ruby
+dist: xenial
+cache: bundler
 rvm:
-  - 2.1.1
-  - 2.0.0
+  - 2.4.1
+  - 2.3.4
+  - 2.2.7
+  - 2.1.10
+matrix:
+  allow_failures:
+    - rvm: 2.1.10
+  fast_finish: true
 
-before_install:
-  - cp Gemfile.lock.development Gemfile.lock
 script:
+  - gem install bundler
   - bundle exec rake spec
   - bundle exec rake cucumber