Update README.md

wilfredinni · web-flow · commit c4e61abecf56 · 2018-09-18T16:02:33.000-03:00
diff --git a/README.md b/README.md
@@ -1635,7 +1635,7 @@ And as an unordered data type, they can't be indexed.
 >>> s[0]
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
-TypeError: 'set' object is not callable
+TypeError: 'set' object does not support indexing
 >>>
 ```
 
