Accept optional punctuation separating words from issue numbers

[PhilMiller]

Right now, a title #1056: Do stuff is not accepted because the regex looks for a space immediately following the issue number.

I the the regex should be something more like ^#?\d+([:;,/&]?|\s).+$

Similarly, in the body, Fixes: #1056 is not accepted by the check (though it is picked up by Github) because of the :

[jstrzebonski]

I just wonder if [;/&] make sense? I mean, I can imagine
#1056: Do stuff
#1056, Do stuff
#1056 - Do stuff

but not really
#1056& Do stuff
or is it more like #1055 & #965: ... ?

[PhilMiller]

Yeah. Really, I think we should be quite a bit looser, as long as there's something that looks like an issue number separated from any other text at the beginning.

[jstrzebonski]

Sure, I can fix it tomorrow.