update CHANGELOG and AUTHORS

Author: rkingsbury

AUTHORS.md

@@ -5,6 +5,7 @@ developed and maintained by the Kingsbury Lab at Princeton University.
 
 Other contributors, listed alphabetically, are:
 
-* Hernan Grecco <[email protected]>
+* @DhruvDuseja
+* Hernan Grecco (@hgrecco)
 
 (If you think that your name belongs here, please let the maintainer know)

CHANGELOG.md

@@ -5,11 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.9.1] - 2023-11-04
 
 ### Added
 
-- `format_solutes_dict()` method added into the utils module to help format solutes dictionaries with a unit.
+- `format_solutes_dict()` method added into the utils module to help format solutes dictionaries with a unit. (@DhruvDuseja)
+
+### Changed
+
+- Native property database is now instantiated on `pyEQL.__init__` to speed subsequent access by `Solution`
+- Numerous performance optimization increased the speed of many `Solution` property and method calls by 3x-10x
 
 ## [0.9.0] - 2023-10-17