Update CHANGELOG.md for v0.49.0

CHANGELOG.md

@@ -26,7 +26,12 @@ Classify the change according to the following categories:
     ### Removed
 
 
-## Develop
+## v0.49.0
+### Added
+- Ability to normalize and scale a custom load profile input to annual or monthly energy input values, for all load types
+### Changed
+- Internal refactoring of the three types of heating loads into a single `HeatingLoad` struct
+- Moved the annual_[energy] data from the load src files into the /data/load_profiles folder
 ### Fixed
 - Constrained export to grid in the NEM bin (`dvProductionToGrid"*_n)][t, :NEM, ts`) to be 0 when system is sized over NEM limit (i.e., when binNEM =0)