update readme - iteratee - callback(null, truthValue)
update readme - iteratee - callback(null, truthValue)

See https://github.com/caolan/async/pull/1060 - either that one is correct or this one is.  Cannot both be true.
steverobb/async,arigo-software/async,jnordberg/async,andalm/async,ecasilla/async,andalm/async,steverobb/async,ezubarev/async,suguru03/async,caolan/async,hargasinski/async,rlugojr/async,ezubarev/async,jnordberg/async,hargasinski/async,suguru03/async,ecasilla/async,rlugojr/async,caolan/async,arigo-software/async