.travis.yml in shellable-0.0.2 vs .travis.yml in shellable-0.0.3

@@ -1,7 +1,9 @@
 language: ruby
 rvm:
 - 2.4
 - 2.5
 - 2.6
+- 2.7
+- 3.0
 script:
 - bundle exec rspec