The open source OpenXR runtime

doc: Mention Proclamation in CONTRIBUTING;

bjorn 3c015817 4de63128

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CONTRIBUTING.md
··· 54 54 the build system automatically turns on quite a few of them. 55 55 If you can't figure out a warning, mention it in the request so we can figure it out together. 56 56 57 + - We use [Proclamation](https://gitlab.com/ryanpavlik/proclamation) to generate release notes. 58 + After creating a merge request for a substantial change, please create one or more changelog 59 + fragments on the branch describing the changes. See 60 + [doc/changes/README.md](doc/changes/README.md) for more info. 61 + 57 62 ### Issues 58 63 59 64 Constructive issues are a valued form of contribution.