.travis.yml in roadie-3.5.1 vs .travis.yml in roadie-4.0.0

@@ -1,12 +1,10 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.1
-  - 2.2
-  - 2.3
   - 2.4
   - 2.5
+  - 2.6
   - jruby
   - rbx
 before_install:
   - gem install bundler -v '1.17.3'
 matrix: