fix README typo
fix README typo

jasonzoladz/persistent,nakaji-dayo/persistent,rdnetto/persistent,jasonzoladz/persistent,mkscrg/persistent,plow-technologies/persistent,mitchellwrosen/persistent,greydot/persistent,gbwey/persistent,erikd/persistent,mkscrg/persistent,gbwey/persistentold,nakaji-dayo/persistent,yesodweb/persistent,andrewthad/persistent,junjihashimoto/persistent,creichert/persistent,meteficha/persistent,superduper/persistent,nakaji-dayo/persistent,superduper/persistent,psibi/persistent,mitchellwrosen/persistent,meteficha/persistent,superduper/persistent,greydot/persistent,mkscrg/persistent,meteficha/persistent,naushadh/persistent,junjihashimoto/persistent,jcristovao/persistent,paul-rouse/persistent,jcristovao/persistent,andrewthad/persistent,andrewthad/persistent,rdnetto/persistent,gbwey/persistent,jcristovao/persistent,mitchellwrosen/persistent,pseudonom/persistent,jasonzoladz/persistent,greydot/persistent,gbwey/persistent,pseudonom/persistent,gbwey/persistentold,bitemyapp/persistent