title: Append a value in a hash object (in Ruby), using an already existing key?
body: <p>How can I append a value in a Hash object using a key that already has a value. So for example
  if I have </p>
  
  <pre><code>&gt;&gt; my_hash = Hash.new
  &gt;&gt; my_hash[:my_key] = "Value1"
  # then append a value, lets say "Value2" to my hash, using that same key "my_key"
  # so that it can be
  &gt;&gt; my_hash[:my_key]
  =&gt; ["Value1", "Value2"]
  </code></pre>
  
  <p>I know its easy to write my own method, but I just wanted to know if there is a built in method. </p>