.travis.yml in zabbixapi-2.4.0 vs .travis.yml in zabbixapi-2.4.1

@@ -1,10 +1,10 @@
 language:
   - ruby
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.1
+  - 2.1
 before_script:
   - wget -qO - http://obs.express42.com/project_root:/zabbix2.4/precise/Release.key | sudo apt-key add -
   - echo "deb http://obs.express42.com/project_root:/zabbix2.4/precise/ ./" | sudo tee /etc/apt/sources.list.d/zabbix.list
   - sudo apt-get update
   - sudo apt-get install libiodbc2