✅ Upgrade rubies. Add 2.6

BookOfGreg · BookOfGreg · commit 3444afff36be · 2019-03-30T21:33:16.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -7,8 +7,9 @@ cache:
   bundler: true
   yarn: true
 rvm:
-  - 2.5.1
-  - 2.3.7
+  - 2.6.2
+  - 2.5.5
+  - 2.3.8
   - jruby-9.1.9.0
 
 gemfile:
