update changelog

CHANGELOG.md

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 # Monaco Editor Changelog
 
+## [0.21.3] (18.01.2021)
+
+Fixes a regression in suggestions where the browser clipboard API would be accessed by incomplete suggestion lists (see https://github.com/microsoft/vscode/commit/96d61842bae1e5dd11f9ff6139fad9e3e5141401).
+
 ## [0.21.2] (27.09.2020)
 
 Fixes [a regression in monaco-css](https://github.com/microsoft/monaco-editor/issues/2158).