Add unified arg hashing (rate limiter, Carmine appender, etc.)
Carmine appender: reconstitute :instant as Date rather than Long
Pull default fmt-output-fn out of config (useful in custom reporting, etc.)
`make-timestamp-fn` is now public
Message formatting: don't call `format` unless formatting args are provided
Carmine appender: fix entry hash fetching for empty level logs
Postal appender: allow control of email content-type, etc.
Carmine appender: better handling when logging unfreezable args (needs Nippy v2.5.1+)
hk
Level checks hk, fix compile-time logging level (prepor)
v3.0.0-RC2
Merge branch 'dev'