I particularly like that he faked the tweet from Life at Google (tried to find it, couldn't), that gave me a good chuckle. I enjoyed the Readme overall, thought that it had a good tone to it. Not too sarcastic but not too serious. Just enough to make me get it's just a silly fun thing he did in some free time.
Yup, it was created in very short time. I use another library GitPython in this and I spent more time with that. GitPython did not have option to make a commit with custom dates, which is very crucial for this project [0]. So I spent time reading it's code and sent a PR which exactly does that [1].