.travis.yml in public_suffix-4.0.0 vs .travis.yml in public_suffix-4.0.1

@@ -3,9 +3,10 @@
 rvm:
   - 2.3
   - 2.4
   - 2.5
   - 2.6
+  - 2.7
   - jruby-9.1.5.0
   - ruby-head
 
 env:
   - COVERAGE=1