title: How to prevent YAML to dump long line without new line
body: <p>While dumping/serializing data having long lines in input, pyyaml adds extra indentation with new line - which is annoying, how can we avoid this conversion in two lines / multiple lines ?</p>
  <p>e.g.</p>
  <p>In [1]:</p>
  <pre><code>x = &quot;-c /home/user/test/test2/test23/tet/2s/test1/stest/longdirectory1/directory2/ --optnion12 --verbose&quot;
  </code></pre>
  <p>In [2]: <code>import yaml</code></p>
  <p>In [3]: <code>print (yaml.dump([dict(ATTRIBUTES=[dict(CONFIG=x)])], default_flow_style=False))</code></p>
  <p><strong>WRONG ONE</strong></p>
  <pre><code>- ATTRIBUTES:
    - CONFIG: -c /home/user/test/test2/test23/tet/2s/test1/stest/longdirectory1/directory2/
        --optnion12 --verbose
  </code></pre>
  <p><strong>Which should be like</strong></p>
  <pre><code>- ATTRIBUTES:
    - CONFIG: -c /home/user/test/test2/test23/tet/2s/test1/stest/longdirectory1/directory2/ --optnion12 --verbose
  </code></pre>