.travis.yml in sidekiq_prometheus-1.8.2 vs .travis.yml in sidekiq_prometheus-1.8.3

@@ -1,8 +1,7 @@
 sudo: false
 language: ruby
 rvm:
+  - 3.1
   - 3.0
   - 2.7
-  - 2.6
-  - 2.5
 before_install: gem install bundler -v 2.2.15