Request setting custom hostName

[DRSDavidSoft]

Hi there, currently the hostname is hardcoded to ENC28J + the last three hex digits of the MAC address:

https://github.com/JAndrassy/EthernetENC/blame/master/src/Dhcp.cpp#L195-L201

I was wondering if it could be possible to set it to a custom value? Perhaps something akin to this PR that is for WIZnet's Ethernet.h?
arduino-libraries/Ethernet#77

Great work BTW, I'm very impressed by how smooth this chip works. I didn't expect it to perform this good, so I appreciate your great library!

[JAndrassy]

do you want to transfer the change to EthernetENC (it has the same DhcpClass) and submit a PR?

[d2weber]

Didn't look at the code. But setting the hostname like this: Ethernet.setHostname("myhostname"); before Ethernet.begin(mac) seems to work.

[JAndrassy]

I added setHostname Oct 3, 2023