.travis.yml in zabbix-client-0.1.0 vs .travis.yml in zabbix-client-0.1.1

@@ -1,6 +1,13 @@
+sudo: false
 language: ruby
+cache: bundler
 rvm:
   - 2.0.0
+  - 2.1.8
+  - 2.2.4
+  - 2.3.0
+before_install:
+  - gem install bundler
 script:
   - bundle install
   - bundle exec rake