Remove reference of py2 from the README

README.rst

@@ -21,19 +21,6 @@ It can be installed with::
   $ pip install --upgrade pyflakes
 
 
-Useful tips:
-
-* Be sure to install it for a version of Python which is compatible
-  with your codebase: for Python 2, ``pip2 install pyflakes`` and for
-  Python3, ``pip3 install pyflakes``.
-
-* You can also invoke Pyflakes with ``python3 -m pyflakes .`` or
-  ``python2 -m pyflakes .`` if you have it installed for both versions.
-
-* If you require more options and more flexibility, you could give a
-  look to Flake8_ too.
-
-
 Design Principles
 -----------------
 Pyflakes makes a simple promise: it will never complain about style,