title: Modify axis to display zero-values as a small bar too
body: <p>I need to display a small bar for zero values too. I achieved that by decreasing the y axis first range parameter:</p>
  
  <pre><code>var y = d3.scale.linear()
      .range([height-10, 0]);
  </code></pre>
  
  <p>The resulting bars look like i want them to look, but the y axis has a gap, that i like to close (below the zero):</p>
  
  <p><img src="https://i.stack.imgur.com/4GXwR.png" alt="enter image description here"></p>
  
  <p>Any hints on how to solve this issue?</p>