Merge pull request #2788 from matrix-org/travis/msc/v6-default

MSC2788: Room version 6 as the default room version

proposals/2788-v6-default-version.md

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+# MSC2788: Room version 6 as a default
+
+Enough time has passed to allow the public federation to upgrade their servers to support room
+version 6. This proposal aims to make v6 the default room version.
+
+## Proposal
+
+The specification adopts v6 as the suggested default room version, making no changes to the stability
+of any room versions. As of writing, v5 is currently the suggested room version.
+
+Room version 6 has the following specification: https://matrix.org/docs/spec/rooms/v6
+
+## Potential issues
+
+Servers will be encouraged to update their config/internal defaults to use v6 instead of v5. This
+is considered a good problem to have.
+
+## Alternatives
+
+None relevant.
+
+## Security considerations
+
+None relevant.
+
+## Unstable prefix
+
+None relevant - servers can already choose a different default room version legally. This MSC
+just formalizes v6 as the default.