.travis.yml in dropcaster-1.0.0 vs .travis.yml in dropcaster-1.1.0

@@ -1,12 +1,18 @@
 language: ruby
 
 rvm:
-- 2.5.1
+- 2.5.7
+- 2.6.5
+- 2.7.0-rc2
 
+matrix:
+  allow_failures:
+  - rvm: 2.7.0-rc2
+
 before_install:
- # https://github.com/travis-ci/travis-ci/issues/8978#issuecomment-377680126
- - gem install bundler
+# https://github.com/travis-ci/travis-ci/issues/8978#issuecomment-377680126
+- gem install bundler
 
 script:
 - bundle exec rake
 - bundle exec rake web:generate