chore(ci): test oldest and latest ruby versions only

DirtyF · DirtyF · commit c5acb5cdcf49 · 2018-12-06T10:06:13.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@ cache: bundler
 sudo: false
 rvm:
 - 2.5
-- 2.4
 - 2.3
 env:
   global:

-Original file line number
+Diff line change
 sudo: false
 rvm:
 - 2.5
 -- 2.4
 - 2.3
 env:
   global: