convert shebang lines: python -> python3
diff --git a/Tools/scripts/fixheader.py b/Tools/scripts/fixheader.py
index 1208031..ec84057 100755
--- a/Tools/scripts/fixheader.py
+++ b/Tools/scripts/fixheader.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Add some standard cpp magic to a header file