Update README

The README should have links to the latest source release and PyPi.
> I'll be explicit about this: I want this sentence the way it is.

Fair enough.

> You have a different opinion, and that is fine.

My "opinion" is to teach users to do what the creators of Python strongly recommend, without even burdening them with potentially new and confusing topics like garbage collection.

Telling them, in an easy to understand way, to do The Right Thing(tm) seems like a good idea to me.

Your "opinion" is to teach users to do *exactly the opposite* of what is strongly recommended, while at the same time confusing them by mentioning garbage collection, which no user of PySoundFile really needs to know.

Sounds like a bad idea to me.

> If the user experiences problems with unclosed files, he will no doubt discover them.

I, as a user, would prefer clear and simple instructions over endless nights of debugging.

> Can we merge now?

As you said, you want this sentence the way it is; you might as well just merge it.
Just know that you don't have my blessing.