Updates Pipe & Makes NetState more testable (#288)

Updates pipe eliminate result and segments from being allocated.

Bumps release version

Projects/Server/Buffers/CircularBufferWriter.cs

@@ -29,10 +29,6 @@ namespace System.Buffers
         public int Length { get; }
         public int Position { get; private set; }
 
-        public CircularBufferWriter(ArraySegment<byte>[] buffers) : this(buffers[0], buffers[1])
-        {
-        }
-
         public CircularBufferWriter(Span<byte> first, Span<byte> second)
         {
             _first = first;