Update README
Update README

- Remark logging config is optional
- Code quote the options to be consistent with other documentation

flyinprogrammer/containerpilot,flyinprogrammer/containerpilot,joyent/containerpilot,tgross/containerbuddy,joyent/containerpilot,justenwalker/containerpilot,tgross/containerbuddy,benoittoulme/containerpilot,joyent/containerpilot,benoittoulme/containerpilot,justenwalker/containerbuddy,justenwalker/containerbuddy,joyent/containerbuddy,benoittoulme/containerpilot,justenwalker/containerpilot,joyent/containerbuddy