convert shebang lines: python -> python3
diff --git a/Lib/base64.py b/Lib/base64.py
index e708136..a8d9f21 100755
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 """RFC 3548: Base16, Base32, Base64 Data Encodings"""