Only build with Rubies Rails 6 supports

tvdeyen · tvdeyen · commit 42f050cbda5e · 2019-08-21T10:58:57.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,9 +3,8 @@ dist: trusty
 sudo: false
 cache: bundler
 rvm:
-- 2.4.5
-- 2.5.5
-- 2.6.2
+  - 2.5.5
+  - 2.6.3
 branches:
   only:
     - master
