.travis.yml in head_music-0.23.0 vs .travis.yml in head_music-0.23.1

@@ -1,5 +1,5 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.3.1
-before_install: gem install bundler -v 1.13.7
+  - 2.6.5
+before_install: gem install bundler