[issue37309] idlelib/NEWS.txt for 3.9.0 and backports

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Release peps -- needed for proposed and actual release dates.
3.7 PEP 537 https://www.python.org/dev/peps/pep-0537/
3.8 PEP 569 https://www.python.org/dev/peps/pep-0569/
3.9 PEP 596 https://www.python.org/dev/peps/pep-0596/

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