Update .travis.yml (JabRef#4463)

rmzelle · web-flow · commit 2822437d06df · 2019-12-19T00:59:55.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,8 @@
-dist: xenial
+dist: bionic
 language: ruby
 cache: bundler
 rvm:
-  - 2.5.3
+  - 2.6.5
 install:
   - bundle install --jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}
   - bundle update sheldon
diff --git a/Gemfile b/Gemfile
@@ -1,4 +1,4 @@
-ruby '2.5.3'
+ruby '2.6.5'
 source 'https://rubygems.org'
 
 gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -64,7 +64,7 @@ DEPENDENCIES
   sheldon!
 
 RUBY VERSION
-   ruby 2.5.3p105
+   ruby 2.6.5p114
 
 BUNDLED WITH
    1.17.3
