repo.get_contents( ) with tag/release parameter

[hehoffmann]

I'm not sure if there is an existing solution and I can't find it, but I would like to load files from an old version of a particular repo. Currently I can only load the latest version of the file from master. So another parameter in repo.get_contents( ) for a version tag would be great.

For example, I would like to load the license file of version v1.53 (https://github.com/PyGithub/PyGithub/blob/v1.53/COPYING) instead of the one from the master (https://github.com/PyGithub/PyGithub/blob/master/COPYING).
repo.get_contents(path="COPYING", tag="v1.53")