Update README.md for the FAKE_ACCOUNT config var.
Update README.md for the FAKE_ACCOUNT config var.

mozilla/pulseguardian,mozilla/pulseguardian,markrcote/pulseguardian,yaoweizhen/pulseguardian,yaoweizhen/pulseguardian,markrcote/pulseguardian,mccricardo/pulseguardian,mccricardo/pulseguardian,yaoweizhen/pulseguardian,mozilla/pulseguardian,mccricardo/pulseguardian,mccricardo/pulseguardian,yaoweizhen/pulseguardian,mozilla/pulseguardian,markrcote/pulseguardian,markrcote/pulseguardian