Fix another formatting issue in README.

Author: Weston Nielson

README.md

@@ -86,7 +86,7 @@ to `stdout`.  A simple example in Python that simply returns the same path is
 given below.
 
 ```python
-!/usr/bin/env python
+#!/usr/bin/env python
 import sys
 
 if len(sys.argv) > 1: