Update to 2.0.0 RTM

[g0t4]

The course was created using dotnet new templates from the 2.0.0-preview1 SDK. Tags in Dockerfiles referred to a generic 2-sdk and not specifically 2.0.0-preview1 so that the Docker aspects of this course wouldn't be affected by 2.0.0's RTM and would have a longer shelf life. That said it's time to update the app code itself to work with the 2.0.0 RTM as the 2-sdk tags now point to RTM images and not preview1 images.

[g0t4]

Currently running the code after building with the new 2.0.0 SDK images results in:

Error:
  An assembly specified in the application dependencies manifest (api.deps.json) was not found:
    package: 'Microsoft.AspNetCore.Antiforgery', version: '2.0.0-preview1-final'
    path: 'lib/netcoreapp2.0/Microsoft.AspNetCore.Antiforgery.dll'
  This assembly was expected to be in the local runtime store as the application was published using the following target manifest files:
    manifest.win7-x64.xml;manifest.win7-x86.xml;manifest.osx-x64.xml;manifest.linux-x64.xml

I'm posting this in case anyone stumbles upon this problem.

[g0t4]

FYI this warning is ok post updating to 2.0.0 RTM, I actually helped with the wording to try to avoid confusion. Learn more about it here: NuGet/Home#5538.

aspnetcore-generator-api/api/api.csproj : warning NU1701: Package 'Faker.Net 1.0.3' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v2.0'. This package may not be fully compatible with your project.

If you don't want to see this NuGet warning you have a few choices: https://github.com/NuGet/Home/wiki/Improved-NuGet-warnings