title: py.test: error: unrecognized arguments: --cov=ner_brands --cov-report=term-missing --cov-config
body: <p>when I am trying to run my test through command line</p>
  
  <pre><code>py.test  file_name.py
  </code></pre>
  
  <p>I got this error:</p>
  
  <pre><code>py.test: error: unrecognized arguments: --cov=ner_brands --cov-report=term-missing --cov-config
  </code></pre>
  
  <p>How can I fix this?</p>