.net core2.2 mysql [DataConnection.DefaultSettings] throw an Exception

Use .net core2.2, reference demo, use [DataConnection.DefaultSettings = new Settings();] throw an exception

Exception message:Could not load file or assembly 'System.Data.SqlClient, Version=4.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Stack trace:
{System.TypeInitializationException: The type initializer for 'LinqToDB.Data.DataConnection' threw an exception. ---> 
System.TypeInitializationException: The type initializer for 'LinqToDB.DataProvider.SqlServer.SqlServerTools' threw an exception. ---> 
System.IO.FileLoadException: Could not load file or assembly 'System.Data.SqlClient, Version=4.5.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. 
The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Settings.cs

public class ConnectionStringSettings : IConnectionStringSettings
{
	public string ConnectionString { get; set; }
	public string Name { get; set; }
	public string ProviderName { get; set; }
	public bool IsGlobal => false;
}

public class Settings : ILinqToDBSettings
{
	public IEnumerable<IDataProviderSettings> DataProviders => Enumerable.Empty<IDataProviderSettings>();

	public string DefaultConfiguration => "MySql";
	public string DefaultDataProvider => "MySql";

	public IEnumerable<IConnectionStringSettings> ConnectionStrings
	{
		get
		{
			yield return new ConnectionStringSettings
			{
				Name = "MySql",
				ProviderName = "MySql",
				ConnectionString = "Server=xxx;Port=3306;Database=xxx;Uid=root;Pwd=xxx;charset=utf8;"
			};
		}
	}
}

Startup.cs

DataConnection.DefaultSettings = new Settings();

Environment details

linq2db version: 2.7.0 Database Server: E.g. Windows Server 2008R2 Database Provider: E.g. MySql Operating system: E.g. Windows 10 Framework version: .NET Core 2.2

[MaceWindu]

We will fix dependency version by #1744 in next bugfix release. For explicit dependency removal task tracking use #1715

[igor-tkachev]