.travis.yml in browser_sniffer-1.1.3 vs .travis.yml in browser_sniffer-1.2.0

@@ -1,9 +1,13 @@
 language: ruby
 rvm:
   - 1.9
   - 2.0
   - 2.1
+  - 2.4
+  - 2.5
+  - 2.6
+  - truffleruby-19.2.0.1 # like 2.6.2
   - jruby
 
 before_install: gem update bundler
 script: bundle exec rake test