Merge pull request #1759 from matrix-org/erikj/rooms_v2

Room v2 proposal

proposals/1759-rooms-v2.md

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+# MSC 1759 - Rooms V2
+
+This MSC proposes creating a new room version to allow servers and users to opt
+in to using the new state resolution algorithm.
+
+
+## Proposal
+
+The new room version is called "2". The only difference between v2 and v1 is
+that v2 rooms use the v2 state resolution algorithm, as defined in MSC 1442 and
+MSC 1693.
+
+It is not proposed that servers change the default room version used when
+creating new rooms.