title: how to put link in the kable() R
body: <p>How can you put link inside the kable()? For example,</p>
  
  <p><code>{r}
  library(knitr)
  x &lt;- cars$speed
  hist(x)
  cars$website[1:10] &lt;- [Link](some url)
  kable(cars)
  </code></p>
  
  <p>Why is that link not working when I knit this? This is html format.</p>