Add Python implementation

README

@@ -104,4 +104,5 @@ mndecode.c	Sample program - decode data from stdin to stdout
 == Other Implementations ==
 
 JavaScript: <https://github.com/mbrubeck/mnemonic.js>
-Go: <https://bitbucket.org/dchapes/mnemonicode>
+Go:         <https://bitbucket.org/dchapes/mnemonicode>
+Python:     <https://github.com/bwhmather/python-mnemonicode>