Added a changelog to the readme
Added a changelog to the readme

Change-Id: Ifa18eda01adccb6e8b7c3f4afe7676fc0ccf02cc

schmunk42/logspout-redis-logstash,nyxcharon/logspout-redis-logstash,schmunk42/logspout-redis-logstash,nyxcharon/logspout-redis-logstash,rtoma/logspout-redis-logstash,rtoma/logspout-redis-logstash