.travis.yml in activejob-cancel-0.1.0 vs .travis.yml in activejob-cancel-0.2.0

@@ -1,13 +1,20 @@
 language: ruby
 rvm:
-  - 2.2.5
-  - 2.3.1
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
 
 gemfile:
   - gemfiles/active_job_42.gemfile
   - gemfiles/active_job_50.gemfile
+  - gemfiles/active_job_51.gemfile
+  - gemfiles/active_job_master.gemfile
 
-before_install: gem install bundler -v 1.11.2
+before_install: gem install bundler
+
+matrix:
+  allow_failures:
+  - gemfile: gemfiles/active_job_master.gemfile
 
 services:
   - redis