micropip: add licensing and upip attribution details.

micropip/micropip.py

@@ -1,10 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-# This is a port of upip to CPython
+# This is a port of the MicroPython upip utility to CPython
-# Port Cpoyright (c) Peter Hinch
+# Port Copyright (c) Peter Hinch
 # Licensed under the MIT license.
 
+# Please note that the author of upip, Paul Sokolovsky, advocates its use
+# rather than this port.
+
 # upip licensing/attribution
 # upip - Package manager for MicroPython
 #