update README about `cookie_domain`option, which is not `auto` by default, i guess that changed when moving to analytics.js [skip ci]
update README about `cookie_domain`option, which is not `auto` by default, i guess that changed when moving to analytics.js [skip ci]
fabn/rack-tracker,railslove/rack-tracker,stackbuilders/rack-tracker,ekorneeff/rack-tracker,fabn/rack-tracker,ekorneeff/rack-tracker,railslove/rack-tracker,stackbuilders/rack-tracker