Remove outdated changelog line

Author: drewcassidy

CHANGELOG.md

@@ -19,7 +19,6 @@ All notable changes to this project will be documented in this file
   managed folder. Setting this property to false will load the implicit framework DLLs instead.
 - Mod dependencies should now be declared with
   `ModReference` items. This avoids the need for the KSP install path to be known at evaluation time.
-- Only include Log.cs (or anything else in include/unity) when `KSPBT_ReferenceUnityAssemblies` is `true` (#61)
 - Fix `KSP_VERSION_MAX` getting mangled when using an existing version file (#64)
 - Fix incorrect behavior when building without a solution (#50)