add changelog entry for 0.17.3 (#449)

* add changelog entry for 0.17.3 * Update CHANGELOG.md
cosmos · Dec 1, 2021 · d994480 · d994480
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 ## Unreleased
 
+## 0.17.3 (December 1, 2021)
+
+### Bug Fixes
+
+* [\#448](https://github.com/cosmos/iavl/pull/448) Change RMutex to Mutex in `VersionExists()`.
+
 ## 0.17.2 (November 13, 2021)
 
 ### Improvements