#48 SdkVersion not saved to project file

[foens]

Hello

I have found a bug where if you choose SDK version to be .NET 2.0 in NDocv3, save the project configuration file, and then open it again, it will have .NET 3.5 selected.

Nothing is saved to the configuration file when choosing .NET 2.0. If 3.5 is chosen, a correct config element is added to the configuration file.

To resolve, I added this configuration element to the file manually:
<property name="SdkDocVersion" value="SDK_v2_0" />