Replaced duplicate point from test example (#237)

* Replaced duplicate point from test example in Python Jarvis March

Author: wmboyles

chapters/computational_geometry/gift_wrapping/jarvis_march/code/py/jarvisMarch.py

@@ -26,7 +26,7 @@ def jarvisMarch(gift):
 
 
 def main():
-    testGift = [(5, 7), (5, 7), (-6, -12), (-14, -14), (9, 9), 
+    testGift = [(-5, 2), (5, 7), (-6, -12), (-14, -14), (9, 9), 
                 (-1, -1), (-10, 11), (-6, 15), (-6, -8), (15, -9),
                 (7, -7), (-2, -9), (6, -5), (0, 14), (2, 8)]
     hull = jarvisMarch(testGift)