Update from garyburd/redigo to gomodule/redigo

[cameronelliott]

Hi Dinesh, thank you very much for creating this, and making it public.

Gary Burd has archived garyburd/redigo and the package is now found at gomodule/redigo

It's also been updated from v1.6.2 to 1.8.5

I updated this package to use the new paths, etc.

Are you still using this in anyway?

If you would like a PR, let me know, if not, I can keep the package at https://github.com/cameronelliott/redislock