Update the volume's default regex to allow optional dot at the end of the volume

[quevon24]

After inspection wrong CL imports related to bad citations, I found that many of them are almost correct, the problem with those citations it that it has a dot after the volume number, one solution is to lean on opinionated by creating citation fixes, the problem with this is that it will take a lot of effort just to remove a dot.

Here are some examples:

139. So. 925 -- > 139 So. 925
144. Pac. 93 --> 144 Pac. 93
149. So. 573 --> 149 So. 573
174. S.E. 235 --> 174 S.E. 235
205. N. W. 661 --> 205 N. W. 661

I propose to update the default volume regex: "(?P<volume>\d+)" to allow an optional dot after the volume number.

Do you see it feasible? Or which path should be taken for these citations?

[mlissner]

That seems fine to me in theory, but I wonder if doing this first would be good: freelawproject/eyecite#117

[flooie]

@mlissner sounds good.