Update README.rst (#20)

Author: Will Myers

README.rst

@@ -328,15 +328,13 @@ the sent signature and ``False`` otherwise.  See `Webhook Security <https://www.
 Contributing
 ------------
 
--  Building the egg: ``python setup.py bdist_egg``
--  Building the wheel: ``python setup.py bdist_wheel --universal``
--  Building the sdist: ``python setup.py sdist``
--  Installing locally: ``python setup.py install``
--  Running tests: ``python setup.py test`` (you'll need to `pip install flake8==3.3.0`)
--  Running lint directly: ``flake8 pybutton``
--  Running tests on all versions: ``tox``
-    - Pre-req: `pip install tox`
-    - Pre-req (if using pyenv): something like `pyenv local 2.7.10 2.6.9 3.1.5 3.3.6 3.4.6 3.5.3 3.6.0`
+*  Building the egg: ``python setup.py bdist_egg``
+*  Building the wheel: ``python setup.py bdist_wheel --universal``
+*  Building the sdist: ``python setup.py sdist``
+*  Installing locally: ``python setup.py install``
+*  Running tests: ``python setup.py test`` (you'll need to ``pip install flake8==3.3.0``)
+*  Running lint directly: ``flake8 pybutton``
+*  Running tests on all versions: ``tox`` (need to ``pip install tox`` and something like ``pyenv local 2.7.10 2.6.9 3.1.5 3.3.6 3.4.6 3.5.3 3.6.0`` if using ``pyenv``)
 
 .. |Build Status| image:: https://travis-ci.org/button/button-client-python.svg?branch=master
    :target: https://travis-ci.org/button/button-client-python