Compatibility for 3.0

For https://github.com/couchbase/docs-sdk-dotnet/blob/3.0dp1/modules/hello-world/pages/start-using-sdk.adoc (still in development), latest information on version compatibility is needed - replacing this for latest 2.x SDK:

The Couchbase .NET SDK is compatable with both Microsoft .NET Framework 4.5 or and Microsoft .NET Core runtimes. Microsoft Visual Studio 2013 or later is assumed in this guide, though you should use 2015 or later if possible. Add the Couchbase .NET SDK to your Visual Studio solution using one of the following methods:

• Using NuGet (recommended method)
• Downloading and referencing the binaries
• Building from source yourself

.NET Framework dependencies are:

• Apache Common Infrastructure Libraries for .NET v3.3.1: http://net-commons.github.io/common-logging/
• Json.NET v9.0.1: https://github.com/JamesNK/Newtonsoft.Json/releases

.NET Core dependencies are:

• Microsoft.Extensions.Logging v1.0.1: https://github.com/aspnet/Logging
• Json.NET v9.0.1: https://github.com/JamesNK/Newtonsoft.Json/releases
  net-commons.github.io