convert shebang lines: python -> python3
diff --git a/Tools/scripts/xxci.py b/Tools/scripts/xxci.py
index 8cffc9e..228f0c0 100755
--- a/Tools/scripts/xxci.py
+++ b/Tools/scripts/xxci.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # xxci
 #