Allow setting cache `VERSION`

[mwarkentin]

It would be nice if we could set the cache version in the url.

Maybe something like 'hiredis:///unix/path/to/socket/file.sock/db[/prefix[:version]]'

This would map closely with the keys that are generated: `"my-prefix:2:my-key"

I currently need to do the following:

CACHES = {'default': django_cache_url.config()}
CACHES['default']['VERSION'] = 2

Would this be something you're interested in adding?

[ghickman]

@mwarkentin – Yup, this seems like a good idea. Unfortunately I'm very busy currently and won't be able to add this any time soon, however I'm more than happy to review any patches for it.

[ghickman]

Addressed in #17, this is now available as a query argument: ?version=2

Released in 1.0.0