updated README with new gem version
updated README with new gem version

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