title: ImportError: cannot import name DependencyWarning
body: <p>I am using python 2.7.12. When i do <code>import requests</code>, I see the error below. </p>
  
  <p>Tried uninstalling &amp; installing requests, upgrading pip as well, but no luck, still same issue. </p>
  
  <pre><code>Python 2.7.12 (default, Nov 19 2016, 06:48:10)
  [GCC 5.4.0 20160609] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import requests
  /home/test/.local/lib/python2.7/site-packages/requests/__init__.py:80: 
  RequestsDependencyWarning: urllib3 (1.13.1) or chardet (2.3.0) doesn't match a supported version!
  RequestsDependencyWarning)
  
  Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  File "/home/test/.local/lib/python2.7/site-packages/requests/__init__.py", line 90, in &lt;module&gt;
  from urllib3.exceptions import DependencyWarning
  ImportError: cannot import name DependencyWarning
  </code></pre>
  
  <p>How can I solve this?</p>