.travis.yml in maily-0.7.0 vs .travis.yml in maily-0.7.1

@@ -3,15 +3,20 @@
 cache: bundler
 
 sudo: false
 
 rvm:
+  - ruby-head
   - 2.5.1
   - 2.4.4
   - 2.3.6
   - 2.2.9
 
 gemfile:
   - gemfiles/rails_5.2.gemfile
   - gemfiles/rails_5.1.gemfile
   - gemfiles/rails_5.0.gemfile
   - gemfiles/rails_4.2.gemfile
+
+matrix:
+  allow_failures:
+    - rvm: ruby-head
\ No newline at end of file