Add dlpack.__version__

v0.2.1

Add version.

Add dlpack.tests.run and tests for numpy.memmap and mmap.mmap

v0.1.1

Revise README

First release of pydlpack v0.1.0

pydlpack is a pure Python package that enables exposing Python objects that may or may not implement the DLPack interface, to consumer array libraries that support DLPack data exchange protocol.