.travis.yml in redis-actionpack-5.2.0.pre vs .travis.yml in redis-actionpack-5.2.0

@@ -4,9 +4,10 @@
 rvm:
   - 2.3
   - 2.4
   - 2.5
   - 2.6
+  - 2.7
   - ruby-head
   - jruby-head
 gemfile:
   - gemfiles/rails_5.0.x.gemfile
   - gemfiles/rails_5.1.x.gemfile