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Update README for KaHIP v3.21

Updated version number from v3.20 to v3.21 and added usage instructions for pip installation.

Merge pull request #165 from alexandersvozil/python-pypi-package

Python pypi package

Merge pull request #156 from qbisi/master

CMakeLists.txt: support installing python module

Update README.md

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Update README.md

Update README.md

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Update README.md