title: How to add a character to the end of every string in a list?
body: <p>Let's say I have a list:</p>
  
  <pre><code>list = ["word", "word2", "word3"]
  </code></pre>
  
  <p>and I want to change this list to:</p>
  
  <pre><code>list = ["word:", "word2:", "word3:"]
  </code></pre>
  
  <p>is there a quick way to do this?</p>