Add link to mario docs

Doc link

Author: python-mario-bot

README.rst

@@ -49,7 +49,7 @@ Overview
 
 .. end-badges
 
-More commands for Mario.
+Contributed commands for `Mario <https://python-mario.readthedocs.org>`__
 
 * Free software: MIT license
 
@@ -64,29 +64,4 @@ Documentation
 =============
 
 
-https://mario-addons.readthedocs.io/
-
-
-Development
-===========
-
-To run the all tests run::
-
-    tox
-
-Note, to combine the coverage data from all the tox environments run:
-
-.. list-table::
-    :widths: 10 90
-    :stub-columns: 1
-
-    - - Windows
-      - ::
-
-            set PYTEST_ADDOPTS=--cov-append
-            tox
-
-    - - Other
-      - ::
-
-            PYTEST_ADDOPTS=--cov-append tox
+* https://mario-addons.readthedocs.io/