don't require .git postfix on remote addresses

Hi! Thanks for writing this! I got lucky and caught it posted to reddit just now - a few days ago I was looking for EXACTLY this tool.

I ran into this problem in the first repository I ran it in, but it was just a tiny fix.

I plan on writing another feature (I'll make another pull of course) that will automatically pull the patch and make a new tracking branch locally (or just switch me to it if it already exists). I am constantly using this workflow and I've been meaning to automate it for a while. This gives me the perfect base upon which to do so.