Update packages#8

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lorddaedra wants to merge 2 commits intopaddle-python:masterfrom

lorddaedra:features/Update-packages

Commits on Jun 12, 2021

Add support for Python 3.9, drop support for (outdated version) Python 3.5, bump version to 2.0.0. Update packages. Change line length from 79 to 120. Configure flake8 `exclude` option.
lorddaedra
committed
Change flake8 tox settings
lorddaedra
committed