README improvements
README improvements

janusnic/clearance,janusnic/clearance,zernie/clearance,zernie/clearance,naveed-ahmad/clearance,janusnic/clearance,thoughtbot/clearance,pedrosmmoreira/clearance,openeducation/clearance,thoughtbot/clearance,benlivermore/clearance,naveed-ahmad/clearance,naveed-ahmad/clearance,pedrosmmoreira/clearance,pedrosmmoreira/clearance,benlivermore/clearance,zernie/clearance,sferik/clearance,thoughtbot/clearance,benlivermore/clearance