title: ScannerError: mapping values are not allowed here
body: <p>Using Tavern and trying to run tavern-ci against this yaml:</p>
  
  <pre><code>test_name: tavern poc
  
    - name: list
      request:
        url: https://xxx.xxx.xxx.us/api/v3/institutions/
        method: GET
      response:
        status_code: 200
        headers:
          content-type: application/json
        save:
          body:
            content: content
  </code></pre>
  
  <p>Am getting 
  E   ScannerError: mapping values are not allowed here
  E     in "/Users/xxx/xxx/xxx/test_poc.tavern.yaml", line 3, column 9</p>
  
  <p>Have tried many of the solutions presented here (most of which are 'put a space after the colon') without joy.</p>
  
  <p>Yamllint gives the same error...</p>