docs: Sunset Python 2

Keep supporting Python 2.7 for one extra year after upstream dropped it: https://www.python.org/doc/sunset-python-2/
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 Written in Python (compatible with Python 2 & 3).

+⚠ Python 2 upstream support stopped on January 1, 2020. yamllint will keep
+best-effort support for Python 2.7 until January 1, 2021. Passed that date,
+yamllint will drop all Python 2-related code.
+
 Documentation
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