Update README.md

ryanplusplus · web-flow · commit 096312dd81c7 · 2016-08-25T11:50:39.000-04:00
diff --git a/README.md b/README.md
@@ -261,7 +261,7 @@ f1:should_be_called_with(1):
 ```
 
 ```
-Unexpected function call f(3)
+Unexpected function call f3(3)
 Completed calls:
   f1(1)
 Incomplete calls:
