update

adding change log entries.

Author: NoelStephensUnity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -9,6 +9,8 @@ Additional documentation and release notes are available at [Multiplayer Documen
 ## [Unreleased]
 
 ### Added
+- Added `FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator)` constructor that uses the `ArraySegment.Offset` as the `FastBufferReader` offset and the `ArraySegment.Count` as the `FastBufferReader` length.
+- Added `FastBufferReader(ArraySegment<byte> buffer, Allocator copyAllocator, int length = -1)` constructor that uses the `ArraySegment.Offset` as the `FastBufferReader` offset.
 
 ### Fixed