DOC: Updating CHANGELOG

Author: ArthurJWH

CHANGELOG.md

@@ -47,6 +47,7 @@ Attention: The newest changes should be on top -->
 - ENH: Add thrustcurve api integration to retrieve motor eng data [#870](https://github.com/RocketPy-Team/RocketPy/pull/870)
 - ENH: Compatibility with MERRA-2 atmosphere reanalysis files [#825](https://github.com/RocketPy-Team/RocketPy/pull/825)
 - ENH: Enable only radial burning [#815](https://github.com/RocketPy-Team/RocketPy/pull/815)
+- ENH: Parachute Inflation Modeling [#867](https://github.com/RocketPy-Team/RocketPy/pull/867)
 
 ### Changed