title: Getting: go: error loading module requirements
body: <p>I am trying to run a go script for SLACK bot that downloaded from git.
  <a href="https://github.com/nlopes/slack/blob/master/examples/websocket/websocket.go#L34" rel="nofollow noreferrer">https://github.com/nlopes/slack/blob/master/examples/websocket/websocket.go#L34</a></p>
  
  <p>I replaced the auth code of my bot in the websocket.go</p>
  
  <pre><code>rchughta@C02WW32YHTD6 ~/g/s/e/websocket&gt; go run websocket.go
  go: finding github.com/pmezard/go-difflib v1.0.0
  go: finding github.com/davecgh/go-spew v1.1.1
  go: finding github.com/stretchr/testify v1.2.2
  go: finding github.com/pkg/errors v0.8.0
  go: finding github.com/gorilla/websocket v1.2.0
  go: github.com/gorilla/websocket@v1.2.0: unknown revision v1.2.0
  go: github.com/davecgh/go-spew@v1.1.1: unknown revision v1.1.1
  go: github.com/pkg/errors@v0.8.0: unknown revision v0.8.0
  go: github.com/stretchr/testify@v1.2.2: unknown revision v1.2.2
  go: github.com/pmezard/go-difflib@v1.0.0: unknown revision v1.0.0
  go: error loading module requirements
  </code></pre>