title: python yaml.dump bad indentation
body: <p>I'm executing the following python code:</p>
  
  <pre><code>import yaml
  
  
  foo = {
      'name': 'foo',
      'my_list': [{'foo': 'test', 'bar': 'test2'}, {'foo': 'test3', 'bar': 'test4'}],
      'hello': 'world'
  }
  
  print(yaml.dump(foo, default_flow_style=False))
  </code></pre>
  
  <p>but is printing:</p>
  
  <pre><code>hello: world
  my_list:
  - bar: test2
    foo: test
  - bar: test4
    foo: test3
  name: foo
  </code></pre>
  
  <p>instead of:</p>
  
  <pre><code>hello: world
  my_list:
    - bar: test2
      foo: test
    - bar: test4
      foo: test3
  name: foo
  </code></pre>
  
  <p>How can I indent the <code>my_list</code> elements this way?</p>