.travis.yml in takosan-1.2.0 vs .travis.yml in takosan-1.3.0

@@ -1,12 +1,12 @@
 language: ruby
 
 rvm:
-  - 1.9.3
   - 2.0.0
   - 2.1
   - 2.2
-  - 2.3.0
+  - 2.3.3
+  - 2.4.0
   - ruby-head
 
 script: rake test
 notifications:
   slack: