Update README and add py_repositories() #218
Merged
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Update the README file to explain the difference between the core Python rules
and the packaging rules. Add the py_repositories() hook and recommend that
users add it to their WORKSPACE files.
Background on the py_repositories() hook: I don't know what this might be
useful for at the moment, but I found pip_repositories() to be helpful when I
added a deprecation message for renaming the workspace to @rules_python. So
it's probably a good idea to have this just in case.
Work toward bazelbuild/bazel#9006.