.travis.yml in rising_dragon-0.4.0 vs .travis.yml in rising_dragon-0.5.0

@@ -1,10 +1,11 @@
 language: ruby
 rvm:
-  - 2.2.7
+  - 2.2.9
   - 2.3.1
-  - 2.3.4
-  - 2.4.1
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
   - ruby-head
 
 sudo: false
 
 matrix: