net/nut: Make myself maintainer per private mail

net/nut: Make myself maintainer per private mail

Current maintainer (Martin Rowe) offered to hand over
maintership because I'm interested in doing more with
the package than he requires for his own use, so he
felt it made sense for me to maintain the package.
I accepted, hence this commit.

Signed-off-by: Daniel Dickinson <lede@cshore.thecshore.com>