* commit '3950ae51e':
Ensure that remove_pusher is always async (#7981)
Ensure the msg property of HttpResponseException is a string. (#7979)
Remove from the event_relations table when purging historical events. (#7978)
Add additional logging for SAML sessions. (#7971)
Add MSC reference to changelog for #7736
Re-implement unread counts (#7736)
Various improvements to the docs (#7899)
Convert storage layer to async/await. (#7963)
Add an option to disable purge in delete room admin API (#7964)
Move some log lines from default logger to sql/transaction loggers (#7952)
Use the JSON module from the std library instead of simplejson. (#7936)
Fix exit code for `check_line_terminators.sh` (#7970)
Option to allow server admins to join complex rooms (#7902)
Fix typo in metrics docs (#7966)
Add script for finding files with unix line terminators (#7965)
Convert the remaining media repo code to async / await. (#7947)
Convert a synapse.events to async/await. (#7949)
Convert groups and visibility code to async / await. (#7951)
Convert push to async/await. (#7948)
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