Precise that we only support SSH-2.

README.md

@@ -1,6 +1,6 @@
 SSH.NET
 =======
-SSH.NET is a Secure Shell (SSH) library for .NET, optimized for parallelism.
+SSH.NET is a Secure Shell (SSH-2) library for .NET, optimized for parallelism.
 
 [![Version](https://img.shields.io/nuget/vpre/SSH.NET.svg)](https://www.nuget.org/packages/SSH.NET)
 [![Build status](https://ci.appveyor.com/api/projects/status/ih77qu6tap3o92gu/branch/develop?svg=true)](https://ci.appveyor.com/api/projects/status/ih77qu6tap3o92gu/branch/develop)