title: EF Core: The name "SqlServerValueGenerationStrategy" does not exist in the current context
body: <p>I just updated my project to ASP .NET Core 2.1 and when I run:</p>
  
  <pre><code>migrations add InitialCreate
  </code></pre>
  
  <p>It creates a migrations folder, but I get this error and my project won't build:</p>
  
  <blockquote>
    <p>The name "SqlServerValueGenerationStrategy" does not exist in the
    current context.</p>
  </blockquote>