Update the branches

[mattip]

What is the status of the hpy, graal-team/hpy and graal-team/hpy-0.0.5 branches here?

hpyproject/hpy HEAD now has more support for the interfaces needed here, and NumPy HEAD has progressed. It would be nice to update this fork and add a blurb to the README so others can try it out.

[mattip]

Ping. PyCon-US is getting closer.

[mattip]

It seems the correct branch is graal-team/hpy, which is the default. Closing.