title: Cannot set axis minimum to greater than 0
body: <p>I'm trying to create a diagram like so:</p>
  
  <pre><code>ax = df.plot(kind="bar", ylim=[1, 5])
  </code></pre>
  
  <p>Unfortunately, the y-axis still begins at zero.</p>
  
  <pre><code>ax.set_ylim([-5, -5])
  </code></pre>
  
  <p>...works as intended.</p>
  
  <p>How do I fix this?</p>