Merge pull request #2174 from matrix-org/rav/proposals/move_redacts_key

MSC2174: Move the `redacts` key to a sane place

proposals/2174-move-redacts-key.md

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+# MSC2174: move the `redacts` property to `content`
+
+[`m.room.redaction`](https://matrix.org/docs/spec/client_server/r0.5.0#m-room-redaction)
+events currently have an *event-level* property `redacts` which gives the event
+ID of the event being redacted.
+
+The presence of this field at the event level, rather than under the `content`
+key,  is anomalous. This MSC proposes that, in a future room version, the
+`redacts` property be moved under the `content` key.
+
+For backwards-compatibility with *older* clients, servers should add a `redacts`
+property to the top level of `m.room.redaction` events in *newer* room versions
+when serving such events over the Client-Server API.
+
+For improved compatibility with *newer* clients, servers should add a `redacts`
+property to the `content` of `m.room.redaction` events in *older* room versions
+when serving such events over the Client-Server API.