.travis.yml in sidekiq_prometheus-1.3.0 vs .travis.yml in sidekiq_prometheus-1.4.0

@@ -1,7 +1,8 @@
 sudo: false
 language: ruby
 rvm:
+  - 3.0
+  - 2.7
+  - 2.6
   - 2.5
-  - 2.4
-  - 2.3
-before_install: gem install bundler -v 1.16.1
+before_install: gem install bundler -v 2.2.15