.travis.yml in karafka-1.2.8 vs .travis.yml in karafka-1.2.9

@@ -2,18 +2,13 @@
 sudo: false
 language: ruby
 cache: bundler
 
 rvm:
-  - 2.3.7
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
   - ruby-head
-  - jruby-9.2.0.0
-
-env:
-  global:
-    - JRUBY_OPTS='--debug'
 
 before_install:
   - gem install bundler
   - gem update --system