Show mastered decks on front page

README.org

@@ -28,6 +28,7 @@ Python scripts to generate a mobile-friendly static site for tracking tcg cards
   - =collectthreshold=: minimum number of owned cards for putting a deck in the “collecting” category
   - =keepsig=: True if you always want to keep one copy of your signature, False if you want to make them all available for trading
   - =tradestatement=: statement to place on your trading page
+  - =maxmastered=: maximum number of most recently mastered decks to show on the index page
 - Run the following:
   #+BEGIN_SRC bash
     python3 setup.py