title: How to solve "MatplotlibDeprecationWarning: scipy.stats.norm.pdf" warning?
body: <p>I am using matplotlib in my Python code. I got following warning: <br>
  <code>xxx.py:88: MatplotlibDeprecationWarning: scipy.stats.norm.pdf
    y = 100 * mlab.normpdf(bin_middles, mu, sigma)*bin_width</code> <br>
  I was wondering what the issue is, so I can solve it and avoid warnings.</p>