fix failing assertion message

Author: colevandersWands

2__python_self_study_1/just_enough_python.md

@@ -156,7 +156,7 @@ assert 4 > 3, 'four is greater than 3'
 assert 4 == 3 # AssertionError
 
 # a failing assertion with a description
-assert 4 == 3, 'four is greater than three' # AssertionError: four is greater than three
+assert 4 == 3, 'four is equal to three' # AssertionError: four is equal to three
 ```
 
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