Fix readme typos and update the badge
Fix readme typos and update the badge

Use the retina quality badge and fix some typos
art19/loggly-rsyslog,art19/loggly-rsyslog,apetresc/loggly-rsyslog,tas50/loggly-rsyslog,apetresc/loggly-rsyslog,tas50/loggly-rsyslog