.travis.yml in feedjira-3.1.0 vs .travis.yml in feedjira-3.1.1

@@ -1,12 +1,12 @@
 language: ruby
 
 cache: bundler
 
 rvm:
-  - 2.2
-  - 2.3
-  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
   - jruby-9
   - ruby-head
 
 env:
   - HANDLER=nokogiri