Updated contrib in README.
Updated contrib in README.

malston/firehose-to-syslog,freeformz/firehose-to-syslog,eljuanchosf/firehose-to-syslog,camelpunch/firehose-to-syslog,anwarchk/firehose-to-syslog,cloudfoundry-community/firehose-to-syslog,anwarchk/firehose-to-syslog,cloudfoundry-community/firehose-to-syslog,shinji62/firehose-to-syslog,malston/firehose-to-syslog