custom format for syslog

[AlexMost]

Hi there, I found your extension useful for my project. One thing I am missing is an ability to provide custom formatter for Syslog message format. What I need is a consistent format with python implementation from here.

Exmple:

<prival>appName: message

It would be great to have an ability to specify custom Syslog formatting function through the options. What do you think?

[cjbarth]

There is already a standard way to do this in winston, using the stringify option when json is enabled or using formatter when json isn't enabled. See https://github.com/winstonjs/winston/tree/2.4.0#custom-log-format.

That isn't exposed via the winston-syslog interface, but it is a one-liner to add which I've commented on in #98.