convert shebang lines: python -> python3
diff --git a/Lib/pdb.py b/Lib/pdb.py
index 22dcff7..b15a3d1 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 """A Python debugger."""