add minitest to gem dependency for jruby
add minitest to gem dependency for jruby

yui-knk/draper,turingschool/draper,outstand/draper,donaldpiret/draper,mallikarjunayaddala/draper,liwangbest/draper,drapergem/draper,estum/draper,estum/draper,turingschool/draper,baberthal/draper,Bastes/draper,sideci-sample/sideci-sample-draper,yui-knk/draper,drapergem/draper,totzyuta/draper,Bastes/draper,totzyuta/draper,SpencerCDixon/draper,liwangbest/draper,krainboltgreene/draper,baberthal/draper,SpencerCDixon/draper,drapergem/draper,chuck-john/draper,outstand/draper,jianyuan/draper,chuck-john/draper,jianyuan/draper,mallikarjunayaddala/draper