Update changelog

CHANGELOG.md

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 # Fornjot - Changelog
 
+## v0.21.0 (2022-10-24)
+
+### End-user improvements
+
+Improvements to Fornjot and its documentation that are visible to end users.
+
+- Improve error message, if model can't be loaded ([#1235])
+- Make sure versions are compatible before loading model ([#1237])
+- Always require model when starting `fj-app` ([#1242])
+- Fix startup delay while model is compiling ([#1244])
+- Print timestamp with each status update ([#1256]; thank you, [@erenoku]!)
+
+### Ecosystem improvements
+
+Improvements to Fornjot components that are relevant to developers building on top of those. These have an indirect effect on end users, through fixed bugs and improved robustness.
+
+#### `fj-host`
+
+- Rename `Watcher::receive`; improve its error handling ([#1234])
+
+#### `fj-kernel`
+
+- Fix last known object duplication issues ([#1233], [#1238])
+- Integrate all remaining objects into centralized object storage ([#1246], [#1247], [#1248], [#1252], [#1255])
+- Simplify use of `MaybePartial` ([#1253])
+- Consolidate builder API for `Face` in `FaceBuilder` ([#1254])
+
+#### `fj-viewer`
+
+- Clean up API ([#1232])
+
+#### `fj-window`
+
+- Simplify `fj_window::run` arguments ([#1243], [#1245])
+
+### Internal Improvements
+
+Improvements that are relevant to developers working on Fornjot itself.
+
+- Compile Fornjot to WebAssembly ([#1221])
+- Update release procedure ([#1225])
+- Run export validation on macOS ([#1226])
+- Update dependencies ([#1227], [#1228], [#1229])
+- Clean up some code ([#1241], [#1251])
+- Update `README.md` ([#1250])
+
+[#1221]: https://github.com/hannobraun/Fornjot/pull/1221
+[#1225]: https://github.com/hannobraun/Fornjot/pull/1225
+[#1226]: https://github.com/hannobraun/Fornjot/pull/1226
+[#1227]: https://github.com/hannobraun/Fornjot/pull/1227
+[#1228]: https://github.com/hannobraun/Fornjot/pull/1228
+[#1229]: https://github.com/hannobraun/Fornjot/pull/1229
+[#1232]: https://github.com/hannobraun/Fornjot/pull/1232
+[#1233]: https://github.com/hannobraun/Fornjot/pull/1233
+[#1234]: https://github.com/hannobraun/Fornjot/pull/1234
+[#1235]: https://github.com/hannobraun/Fornjot/pull/1235
+[#1237]: https://github.com/hannobraun/Fornjot/pull/1237
+[#1238]: https://github.com/hannobraun/Fornjot/pull/1238
+[#1241]: https://github.com/hannobraun/Fornjot/pull/1241
+[#1242]: https://github.com/hannobraun/Fornjot/pull/1242
+[#1243]: https://github.com/hannobraun/Fornjot/pull/1243
+[#1244]: https://github.com/hannobraun/Fornjot/pull/1244
+[#1245]: https://github.com/hannobraun/Fornjot/pull/1245
+[#1246]: https://github.com/hannobraun/Fornjot/pull/1246
+[#1247]: https://github.com/hannobraun/Fornjot/pull/1247
+[#1248]: https://github.com/hannobraun/Fornjot/pull/1248
+[#1250]: https://github.com/hannobraun/Fornjot/pull/1250
+[#1251]: https://github.com/hannobraun/Fornjot/pull/1251
+[#1252]: https://github.com/hannobraun/Fornjot/pull/1252
+[#1253]: https://github.com/hannobraun/Fornjot/pull/1253
+[#1254]: https://github.com/hannobraun/Fornjot/pull/1254
+[#1255]: https://github.com/hannobraun/Fornjot/pull/1255
+[#1256]: https://github.com/hannobraun/Fornjot/pull/1256
+
+[@erenoku]: https://github.com/erenoku
+
+
 ## v0.20.0 (2022-10-17)
 
 ### End-user improvements