Changelog:
==========
No need to push a new app context in the test client #1669
Remove 3.6 and pypy-3.6 builds, add 3.10 and pypy-3.8
Improve documentation on start_background_task() function
changed room argument to to in documentation examples #1665
Fix documentation typo #1793
Fix example code in documentation #1787
Signed-off-by: Xu Huan <xuhuan.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
