Update README to markdown syntax

README.rst

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-========
-postgres
-========
-
-.. note::
-
-    See the full `Salt Formulas installation and usage instructions
-    <http://docs.saltstack.com/en/latest/topics/development/conventions/formulas.html>`_.
-
-Available states
-================
-
-.. contents::
-    :local:
-
-``postgres``
-------------
-
-Installs the postgresql package.
-
-``postgres.python``
--------------------
-
-Installs the postgresql python module
-
-Testing
-=======
-
-Testing is done wit kitchen-salt
-
-``kitchen converge``
---------------------
-
-Runs the postgres main state
-
-``kitchen verify``
-------------------
-
-Runs serverspec tests on the actual instance
-
-``kitchen test``
-----------------
-
-Builds and runs test from scratch
-
-``kitchen login``
------------------
-
-Gives you ssh to the vagrant machine for manual testing
-