Update changelog

com.unity.render-pipelines.high-definition/CHANGELOG.md

 
 ## [2018.2 undecided]
 - Fix issue with LOD transition and instancing
+- Fix discrepency between object motion vector and camera motion vector
 
 ### Improvements
 - Add stripper of shader variant when building a player. Save shader compile time.
 
 ### Changed, Removals and deprecations
 - Removed GlobalLightLoopSettings.maxPlanarReflectionProbes and instead use value of GlobalLightLoopSettings.planarReflectionProbeCacheSize
+- Changed SupportForwardOnly to SupportOnlyForward in render pipeline settings
 
 ## [2018.1 undecided]