Fixes [a regression in monaco-css](https://github.com/microsoft/monaco-editor/issues/2158).
### Breaking changes
* `monaco.uri` methods `file, from, isUri, joinPath, parse, revive` are now static. Changing `new monaco.uri.method` to `monaco.uri.method` resolves 'TypeError: monaco.Uri.file is not a constructor at...' errors.
## [0.21.1] (24.09.2020)
Fixes [a few regressions](https://github.com/microsoft/monaco-editor/issues?q=is%3Aissue+milestone%3A%22August+2020+%282%29%22+is%3Aclosed).