update changelog for v9.2.1

CE-Programming · Sep 11, 2021 · d756ff5 · d756ff5
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Showing 1 changed file with 6 additions and 1 deletion.
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 # Change Log
 
-## [Unreleased](https://github.com/CE-Programming/toolchain/compare/v9.2...master)
+## [Unreleased](https://github.com/CE-Programming/toolchain/compare/v9.2.1...master)
+
+# [v9.2.1](https://github.com/CE-Programming/toolchain/releases/tag/v9.2.1) (2021-09-11)
+
+  - Patch for edge case where `delay()` and `usleep()` functions may freeze
+  - Minor documentation updates
 
 # [v9.2](https://github.com/CE-Programming/toolchain/releases/tag/v9.2) (2021-09-09)