Add support for slog.Level fields (#37)

Also
* Bump to 1.21 for slog support

Allow value splitting pattern to be customized (#32)

Trim off blank values of slice and map arguments (#30)

Allow slice and map fields to accept newline delimited values (#29)

Add support for types with encoding.TextUnmarshaler (#25)

A generic mechanism for supporting new types (#23)

Restore 1.16 compatibility (#22)

add support for net.IP, net.IPNet, net.HardwareAddr(MAC) and time.Time (

#20)

Co-authored-by: Geoff Bourne <[email protected]>

build(deps): bump github.com/stretchr/testify from 1.8.1 to 1.8.2 (#19)

ignore children of ignored field (#10)