Update test ruby version

mashiro · mashiro · commit e3a2b9a47521 · 2019-06-04T17:57:04.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.0
-
+  - 2.3.8
+  - 2.4.6
+  - 2.5.5
+  - 2.6.3

-Original file line number
+Diff line change
 language: ruby
 rvm:
 -  - 1.9.3
 -  - 2.0.0
 -  - 2.1.0
+-
 +  - 2.3.8
 +  - 2.4.6
 +  - 2.5.5
 +  - 2.6.3