STDOUT/STDERR level configuration

In this minor release, it's now possible to specify different streams to use for normal logs versus error logs. This allows your applications to configure what error log level to redirect to STDERR - useful for error logging tools like Glitchtip!

What's Changed

• feature: allow configuration between stdout/stderr closes #33 by @g105b in #34

Full Changelog: v1.0.1...v1.1.0