Signed-off-by: Stuart Mumford <stuart@cadair.com>
As a document which is versioned, we should have a changelog for it. It might be empty most of the time but oh well.
matrix:
* Copy spec PR near-verbatim from past PR With light review being addressed. https://github.com/matrix-org/matrix-doc/pull/3168 * Alter for modern day * Add changelog * specify that we're using the grammar