convert shebang lines: python -> python3
diff --git a/Tools/webchecker/wsgui.py b/Tools/webchecker/wsgui.py
index b2223c4..032523b 100755
--- a/Tools/webchecker/wsgui.py
+++ b/Tools/webchecker/wsgui.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 """Tkinter-based GUI for websucker.