Add support for both list and tuple coordinates.

Author: lgw4

area/__init__.py

@@ -27,7 +27,7 @@ def ring__area(coordinates):
     {float} The approximate signed geodesic _area of the polygon in square meters.
     """
 
-    assert isinstance(coordinates, list)
+    assert isinstance(coordinates, (list, tuple))
 
     _area = 0
     coordinates_length = len(coordinates)
@@ -60,7 +60,7 @@ def ring__area(coordinates):
 
 def polygon__area(coordinates):
 
-    assert isinstance(coordinates, list)
+    assert isinstance(coordinates, (list, tuple))
 
     _area = 0
     if len(coordinates) > 0: