Add a whatsnew entry about async contextlib.nullcontext

[tomgrin10]

BPO	42396
Nosy	@miss-islington, @tomgrin10
PRs	bpo-42396: Add a whatsnew entry about async contextlib.nullcontext #23357

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-11-17.23:00:33.616>
created_at = <Date 2020-11-17.22:20:31.827>
labels = ['3.10']
title = 'Add a whatsnew entry about async contextlib.nullcontext'
updated_at = <Date 2020-11-17.23:00:33.615>
user = 'https://github.com/tomgrin10'

bugs.python.org fields:

activity = <Date 2020-11-17.23:00:33.615>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-17.23:00:33.616>
closer = 'asvetlov'
components = []
creation = <Date 2020-11-17.22:20:31.827>
creator = 'tomgrin10'
dependencies = []
files = []
hgrepos = []
issue_num = 42396
keywords = ['patch']
message_count = 1.0
messages = ['381302']
nosy_count = 2.0
nosy_names = ['miss-islington', 'tomgrin10']
pr_nums = ['23357']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42396'
versions = ['Python 3.10']

[miss-islington]

New changeset 9c98e8c by Tom Gringauz in branch 'master':
bpo-42396: Add a whatsnew entry about async contextlib.nullcontext (GH-23357)
9c98e8c