Update README.md to for Class-based implementation

Author: cclauss

README.md

@@ -1,9 +1,10 @@
-High Scores
-===========
+HighScores
+==========
 
 High Scores module for Python.
 By Tj Ferry.
 
-This module currently supports two main public functions:
-+ `is_high_score(username, score)` will return True if this is the first score or the highest score for this user.  Otherwise False will be returned.  The `score` parameter should be numeric (int, long, float, etc.) and NOT a string.
-+ `print_scores()` prints out a formatted list of all users with their high scores
+This module contains a HighScores class that supports three main public methods:
++ `__init__([file_name])` which takes an optional name for the file used to record the high scores.
++ `is_high_score(username, score)` will return True if this is the first score or the highest score for this user.  Otherwise, False will be returned.  The `score` parameter should be numeric (int, long, float, etc.) and NOT a string.
++ `print_scores()` prints out a sorted, formatted list of all users with their high scores