add changelog entry for PR#3391
add changelog entry for PR#3391

Signed-off-by: Michael Telatynski <94c9867e567d21b48f1c67ccab9a43d4b4ded84f@gmail.com>

matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse,matrix-org/synapse