.travis.yml in clockwork-2.0.3 vs .travis.yml in clockwork-2.0.4

@@ -1,14 +1,18 @@
 language: ruby
 sudo: false
 cache: bundler
+before_install:
+  - gem update --system
+  # This is required to support ActiveSupport 4
+  # https://docs.travis-ci.com/user/languages/ruby/#bundler-20
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1
-  - 2.2
-  - ruby-2.3.1
-  - jruby-19mode
-  - # rbx-2.2.7
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - jruby-9.1.17.0
+  - jruby-9.2.6.0
 gemfile:
-  - gemfiles/activesupport3.gemfile
   - gemfiles/activesupport4.gemfile
+  - gemfiles/activesupport5.gemfile