tolerate bigger delta in retry middleware test
tolerate bigger delta in retry middleware test

Helped JRuby in 1.9 mode

flower-pot/faraday,ngpestelos/faraday,ekampp/faraday,prcongithub/faraday,apepper/faraday,jrafanie/faraday,customink/faraday,mehulkar/faraday,flower-pot/faraday,nevans/faraday,davoclavo/faraday,grosser/faraday,grosser/faraday,hrysd/faraday,iamjarvo/faraday,jhass/faraday,AvaelKross/faraday,pvdb/faraday,coinbase/faraday,ru-faraon/Faraday-is-an-HTTP-client,davidcornu/faraday,zhaoxl/faraday,pvdb/faraday,santiagodoldan/faraday,luvtechno/faraday,coinbase/faraday,stayhero/faraday,mehulkar/faraday,customink/faraday,apepper/faraday,jrafanie/faraday,daviswahl/faraday,jhass/faraday,O-I/faraday,hstrowd/faraday,ru-faraon/Faraday-is-an-HTTP-client,iamjarvo/faraday,ngpestelos/faraday,O-I/faraday,ekampp/faraday,lostisland/faraday,hstrowd/faraday,spyofchina/faraday,hrysd/faraday,AvaelKross/faraday,mauricionr/faraday,davoclavo/faraday,spyofchina/faraday,davidcornu/faraday,zanker/faraday,zanker/faraday,zhaoxl/faraday,stayhero/faraday,petems/faraday,prcongithub/faraday,nevans/faraday,daviswahl/faraday,luvtechno/faraday,engineyard/faraday,santiagodoldan/faraday,petems/faraday,engineyard/faraday,mauricionr/faraday,lostisland/faraday