.travis.yml in enter-rockstar-0.2 vs .travis.yml in enter-rockstar-0.2.1

@@ -1,10 +1,9 @@
 sudo: false
 language: ruby
 rvm:
   - 2.3.8
-  - 2.4.5
-  - 2.5.5
-  - 2.6.2
-before_install:
-  - gem install bundler
-  - gem update --system
+  - 2.4.9
+  - 2.5.7
+  - 2.6.5
+  - 2.7.0
+before_install: gem install bundler -v 2.1.2