Updated the docs to contain a link to nuget.org (#466)

Author: martingbrown

doc/release-notes/2.0.md

@@ -1,6 +1,6 @@
 # 2.0 Release Notes
 
-Version 2.0.0 of the Npgsql Entity Framework Core provider has been released and is available on nuget. This version works with [version 2.0.0 of Entity Framework Core](https://blogs.msdn.microsoft.com/dotnet/2017/08/14/announcing-entity-framework-core-2-0/), and contains some new Npgsql features as well.
+Version 2.0.0 of the Npgsql Entity Framework Core provider has been released and is available on [nuget.org](https://www.nuget.org/packages/Npgsql.EntityFrameworkCore.PostgreSQL). This version works with [version 2.0.0 of Entity Framework Core](https://blogs.msdn.microsoft.com/dotnet/2017/08/14/announcing-entity-framework-core-2-0/), and contains some new Npgsql features as well.
 
 ## New Features