feat: Exclude a package from update

[mbevc1]

It would be useful to have an exclude flag when updating in order to skip packages you don't want to update. It's the opposite of updating a single package and perhaps slightly adjacent to issue we have for version pinning #126 :)

e.g. bin update -x /some/path/binary

[marcosnils]

yep, I like it. Additionally we could introduce a similar concept of apt-mark hold which persists this config in case you don't want to specify it each time.

[mbevc1]

Sounds good :+1:

[mbevc1]

If I find some time I'll try looking into it and see if there is anything quick we could do here :)