Update README about tests and reporting issues
Update README about tests and reporting issues

collectiveidea/audited,xuwupeng2000/audited,instacart/audited,zorab47/acts_as_audited,brandonaaron/acts_as_audited,azanar/audited,lrgalego/audited,ajoulie/audited,ledermann/audited,cfiorini/audited,ZHANGJIE982/audited,Datacom/audited,happio/audited,ConsultingMD/audited,ktheory/acts_as_audited,airbnb/audited,klatunetworks/audited,simplepractice/audited,reenhanced/audited,ontrack/audited,ishail/audited,GhostGroup/audited