update travis ruby versions

diff --git a/.travis.yml b/.travis.yml
index b163d7f3d3ff5c570e792f5cd9e2c2c843ebe2d1..1190e04c4cadebb4fb03d6e1d2f64d6ef21246a4 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,14 @@
+---
 sudo: required
 dist: trusty
 language: ruby
 before_install:
-- gem update --system
+  - gem update --system
 before_script:
-- npm install -g eslint
+  - npm install -g eslint
 rvm:
-- 2.0.0
-- 2.1
-- 2.2
-- 2.3.3
-- 2.4.0
+  - 2.1.10
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1