Update nuget package

[corredor28]

First, thanks for your amazing work with this project! It has helped us a lot.

We need to work with the SetDataSourceCredentials method of the Fluent interface, but the current nuget available version does not seem to have it (unless we are doing something wrong).

Is it possible for you to create a new version of the nuget package? We can only see two alternatives right now: download and compile the project and add local references, or fork this project and generate another nuget package.

Thanks again.