title: NLua nuget package restore failed in VS 2017
body: <p>I am trying to create a .NET 4.6.1 Class Library an use this nuget package with it:</p>
  
  <p><a href="https://www.nuget.org/packages/NLua/" rel="nofollow noreferrer">https://www.nuget.org/packages/NLua/</a></p>
  
  <p>When I click install I get this message:</p>
  
  <pre><code>Package restore failed. Rolling back package changes for 'ClassLibrary1'.
  </code></pre>
  
  <p>If I try the same install with a web application in the same solution, the install completes successfully.</p>