title: Rails AXLSX gem trying to merge cells of last row created
body: <p>I have an axlsx file with some logic in there that creates rows. I have a check in there, that when a certain condition is met, i want to merge the last cells created. How can i do this?</p>
  
  <p>The only way that i've seen how to merge cells is by specifying the cells to merge like this:</p>
  
  <pre><code>sheet.merge_cells "A2:B2"
  </code></pre>
  
  <p>but if i have a dynamic sheet, how can i merge cells of the last row created?</p>