fix spelling error in changelog

Author: Conengmo

CHANGES.txt

@@ -8,7 +8,7 @@ New features
 Bug fixes
 
 -  Fix streamlit-folium compatibility (add layer to map with new class) (@Conengmo #1834)
--  Improve docstring preview readibility in features.py (@BastienGauthier #1833)
+-  Improve docstring preview readability in features.py (@BastienGauthier #1833)
 
 
 0.15.0