.travis.yml in games_dice-0.3.12 vs .travis.yml in games_dice-0.4.0

@@ -1,14 +1,11 @@
 language: ruby
+
 before_install:
  - gem install bundler
-rvm:
-  - "2.0.0"
-  - "2.1.0"
-  - "2.1.1"
-  - "2.1.4"
-  - "2.2.0"
-  - "2.3.1"
-  - "2.4.1"
-  - "2.4.2"
-  - jruby-9.0.5.0
 
+os:
+  - linux
+
+rvm:
+  - "2.7.1"
+  - "3.0.0"