edited readme file removing slash in pytest coverage instructions

Author: aqreed

README.rst

@@ -160,7 +160,7 @@ To test code coverage, make sure you install `py.test-cov`_ extension and run:
 
 .. code-block:: bash
 
-        $ pytest --cov skaero/
+        $ pytest --cov skaero
 
 .. _`py.test-cov`: https://pypi.python.org/pypi/pytest-cov