updated coveralls gem to fix Encoding::UndefinedConversionError
updated coveralls gem to fix Encoding::UndefinedConversionError

fhernandez173/thor,b-dean/thor,groovenauts/thor,segiddins/thor,linkodehub/thor,sideci-sample/sideci-sample-thor,flyinbutrs/thor,sideci-sample/sideci-sample-thor,flyinbutrs/thor,fancyremarker/thor,b-dean/thor,linkodehub/thor,segiddins/thor,fancyremarker/thor,erikhuda/thor,doudou/thor,fhernandez173/thor,groovenauts/thor