title: missing go.sum entry for module providing package <package_name>
body: <p>Using the buffalo framework,
  after bootstraping it via <code>buffalo new &lt;project_name&gt;</code></p>
  <p>I am trying to run <code>buffalo dev</code>
  Expecting to see:</p>
  <blockquote>
  <p>project running on port 3000</p>
  </blockquote>
  <p>But I am getting those error messages instead</p>
  <pre><code>actions/app.go:4:2: missing go.sum entry for module providing package github.com/gobuffalo/buffalo (imported by sc_api/actions); to add:go get sc_api/actions
  
  actions/app.go:13:2: missing go.sum entry for module providing package github.com/gobuffalo/mw-csrf (imported by sc_api/actions); to add: go get sc_api/actions
  </code></pre>
  <p><code>actions/app.go</code> has been generated by buffalo, but in case you are wondering the error does match the import statement in this file.</p>
  <pre><code>// app.go
  package actions
  
  import (
      &quot;github.com/gobuffalo/buffalo&quot;  // 1rst line
      &quot;github.com/gobuffalo/envy&quot;
      forcessl &quot;github.com/gobuffalo/mw-forcessl&quot;
      paramlogger &quot;github.com/gobuffalo/mw-paramlogger&quot;
      &quot;github.com/unrolled/secure&quot;
  
      &quot;sc_api/models&quot;
  
      &quot;github.com/gobuffalo/buffalo-pop/v2/pop/popmw&quot;
      csrf &quot;github.com/gobuffalo/mw-csrf&quot;  // 2nd line
      i18n &quot;github.com/gobuffalo/mw-i18n&quot;
      &quot;github.com/gobuffalo/packr/v2&quot;
  )
  </code></pre>
  <p>What does it mean ? How do I fix it ?</p>