updated release notes in nuspec
updated release notes in nuspec

steve600/JSON-RPC.NET,steve600/JSON-RPC.NET,artnim/JSON-RPC.NET,dawesc/JSON-RPC.NET,KAAndrey/JSON-RPC.NET,artnim/JSON-RPC.NET,Astn/JSON-RPC.NET,artnim/JSON-RPC.NET,Astn/JSON-RPC.NET,KAAndrey/JSON-RPC.NET,steve600/JSON-RPC.NET,Astn/JSON-RPC.NET,dawesc/JSON-RPC.NET,KAAndrey/JSON-RPC.NET,dawesc/JSON-RPC.NET