Replace dead link with StackOverflow answer

Author: Ian Cordasco

docs/user/install.rst

@@ -18,7 +18,7 @@ or, with `easy_install <http://pypi.python.org/pypi/setuptools>`_::
 
     $ easy_install requests
 
-But, you really `shouldn't do that <http://www.pip-installer.org/en/latest/other-tools.html#pip-compared-to-easy-install>`_.
+But, you really `shouldn't do that <https://stackoverflow.com/questions/3220404/why-use-pip-over-easy-install>`_.
 
 
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