Update rubygems

JonRowe · JonRowe · commit a8d8fb6a6541 · 2018-04-04T19:36:24.000+10:00
diff --git a/.travis.yml b/.travis.yml
@@ -23,6 +23,8 @@ cache: bundler
 bundler_args: "--binstubs --path ../bundle --retry=3 --jobs=3"
 
 before_install:
+  - gem update --system
+  - gem install bundler
   - script/clone_all_rspec_repos
 
 before_script:
