Fix usage problem due to README changes
Fix usage problem due to README changes

Changes made in 3b9378cab79b4d2b0000766ccaec1a2bbde83c8d broke
the regex that took the Usage slice out of README.md. This change to the
regex results in the correct excerpt being pulled.

thoughtbot/parity,gabebw/parity,winston/parity,gabebw/parity,winston/parity,thoughtbot/parity