MNT: Add recent changes to CHANGELOG.

Author: phmbressan

CHANGELOG.md

@@ -31,11 +31,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 Attention: The newest changes should be on top -->
 
 ### Added
-- ENH: Controller (AirBrakes) and Sensors Encoding [#849] (https://github.com/RocketPy-Team/RocketPy/pull/849)
-- EHN: Addition of ensemble variable to ECMWF dictionaries [#842] (https://github.com/RocketPy-Team/RocketPy/pull/842) 
+- ENH: Tank Fluids with Variable Density from Temperature and Pressure [#852](https://github.com/RocketPy-Team/RocketPy/pull/852)
+- ENH: Controller (AirBrakes) and Sensors Encoding [#849](https://github.com/RocketPy-Team/RocketPy/pull/849)
+- EHN: Addition of ensemble variable to ECMWF dictionaries [#842](https://github.com/RocketPy-Team/RocketPy/pull/842) 
 - ENH: Added Crop and Clip Methods to Function Class [#817](https://github.com/RocketPy-Team/RocketPy/pull/817)
 - DOC: Add Flight class usage documentation and update index [#841](https://github.com/RocketPy-Team/RocketPy/pull/841)
-- ENH: Discretized and No-Pickle Encoding Options [#827] (https://github.com/RocketPy-Team/RocketPy/pull/827)
+- ENH: Discretized and No-Pickle Encoding Options [#827](https://github.com/RocketPy-Team/RocketPy/pull/827)
 - ENH: Add the Coriolis Force to the Flight class [#799](https://github.com/RocketPy-Team/RocketPy/pull/799)
 - ENH: Improve parachute geometric parametrization [#835](https://github.com/RocketPy-Team/RocketPy/pull/835)