Fix Values omitting null values

The Values function omitted null values causing SQL errors. This release fixes the issue

Nuget packages:
WindupButton.Roscoe
WindupButton.Roscoe.Postgres
WindupButton.Roscoe.SqlServer

Roscoe 0.1

🎉 First release 🎉

Supports some syntax for selecting, inserting, updating & deleting in Postgres & SQL Server along with some db functions.

Nuget packages:
WindupButton.Roscoe
WindupButton.Roscoe.Postgres
WindupButton.Roscoe.SqlServer