.travis.yml in howitzer-2.1.1 vs .travis.yml in howitzer-2.2.0

- old
+ new

@@ -1,7 +1,8 @@ language: ruby before_install: - gem install bundler rvm: - - 2.2.8 - - 2.3.5 - - 2.4.2 + - 2.3.8 + - 2.4.9 + - 2.5.7 + - 2.6.5