added note on new forms in changelog

Author: ccoffrin

CHANGELOG.md

@@ -5,7 +5,8 @@ ThreePhasePowerModels.jl Change Log
 - nothing
 
 ### v0.1.1
-- Updated SOCBFPowerModel to more closely match published refrence model
+- Added a variety of matrix-based branch flow formulations
+- Updated LPLinUBFForm to more closely match published refrence model
 - Update MINLP solvers used in testing
 - Added basic docs setup
 - Minor improvements to OpenDSS parser #29, #59, #62, #63, #64, #65