Travis: minor tweak

jrfnl · jrfnl · commit ab83c4878b06 · 2020-06-10T20:10:54.000+02:00
This was causing a warning. Fixed now.
diff --git a/.travis.yml b/.travis.yml
@@ -76,8 +76,7 @@ jobs:
     - stage: docs
       language: ruby
       cache: bundler
-      rvm:
-        - 2.5.8
+      rvm: 2.5.8
       before_install: skip
       install:
         - cd ./docs
