Specify files to update version numbers in #10
Description
The user might want to store the version number in a file other than the bumpversion config, e.g. in the source code so that compiled programs can report their own version number without needing to be run from the source repo.
bump2version has a way of doing the appropriate search and replace on specified files. It would be nice to allow adding (& removing?) these file specifications from the command line.