www/rubygem-faraday_middleware: upgrade to 0.9.1, set license

• upgrade to 0.9.1
• set LICENSE to MIT
• assign maintainer to ruby@

PR: 195757
Differential Revision: https://reviews.freebsd.org/D1277
Submitted by: Michael Moll <kvedulv@kvedulv.de>
Approved by: swills (mentor)