Updated readme with logger path instructions
Updated readme with logger path instructions

Current readme doesn't include instructions on simple logger_path config setting, almost switched gems before digging through code to realize this was an option.
jdurand/logstasher,ministryofjustice/logstasher,shadabahmed/logstasher,alexdean/logstasher,jphelps413/logstasher,MarcGrimme/logstasher,roolo/logstasher