Added Ruby 2.1.0 and 2.1.1 to Travis config
Added Ruby 2.1.0 and 2.1.1 to Travis config

blacklane/logstash-logger,ashrestha91/logstash-logger,dwbutler/logstash-logger,Nikita-V/logstash-logger,yuzu-es/logstash-logger,yads/logstash-logger