Update to 2.7.1
- Add LICENSE_FILE
- Add GitHub repository to WWW
Changes: https://github.com/psycopg/psycopg2/blob/master/NEWS
http://initd.org/psycopg/articles/2017/03/13/psycopg-271-released/ http://initd.org/psycopg/articles/2017/03/01/psycopg-27-released/