title: Change position of plotly hover box R
body: <p>I would like to change the position of the hover box in a <code>plotly</code> bar chart. Rather than have it popup on the left or right, I would like it to popup above the bar. Is this possible? I've been googling this and staring at the Plotly R reference page for a couple hours with no luck.</p>
  
  <p>Here's a sample:</p>
  
  <pre><code>library(dplyr)
  library(plotly)
  data.frame(x = 1:10, y = 1:10*10) %&gt;% 
    plotly::plot_ly(data = .) %&gt;%
    plotly::add_trace(x = ~x, 
                      y = ~y, 
                      type = 'bar', 
                      hoverinfo = "text", 
                      text = ~y)
  </code></pre>