convert shebang lines: python -> python3
diff --git a/Tools/webchecker/websucker.py b/Tools/webchecker/websucker.py
index 3bbdec3..8076af5 100755
--- a/Tools/webchecker/websucker.py
+++ b/Tools/webchecker/websucker.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 """A variant on webchecker that creates a mirror copy of a remote site."""