remove unnecessary attr_reader in StateMachine class
remove unnecessary attr_reader in StateMachine class

aasm/aasm,bilby91/aasm,luxola/aasm,oswaldoferreira/aasm,yui-knk/aasm,xieyunzi/aasm,Aryk/aasm,ASnow/aasm,reidmorrison/aasm,allspiritseve/aasm,HoyaBoya/aasm,hspazio/aasm,nickpellant/aasm,Funfun/aasm,pskrz/aasm,intfrr/aasm,awsmsrc/aasm,joshsoftware/aasm,artofhuman/aasm