.travis.yml in thor-hollaback-0.1.2 vs .travis.yml in thor-hollaback-0.2.0

@@ -1,6 +1,9 @@
 language: ruby
-rvm: 2.3.1
+rvm: 2.6
+branches:
+  only: master
 cache: bundler
+before_install: gem install bundler
 script:
 - bundle exec rake
 - bundle exec rubocop