.travis.yml in vnstat-ruby-2.0.0 vs .travis.yml in vnstat-ruby-3.0.0

@@ -1,13 +1,12 @@
 sudo: false
 language: ruby
 rvm:
- - '2.1.10'
- - '2.2.8'
- - '2.3.6'
- - '2.4.3'
- - '2.5.0'
-before_install: gem install bundler -v 1.14.6
+ - '2.3.8'
+ - '2.4.5'
+ - '2.5.3'
+ - '2.6.1'
+before_install: gem install bundler -v 2.0.1
 script: bundle exec rspec
 addons:
   code_climate:
     repo_token: 06a44082b0f5a5114eec226952c45443a4ac8c86e59e098869b5c07e420505ab