_checkServicePresence throws a reject although it says it will never do so

[sjmcdowall]

https://github.com/flywheelsports/hydra/blob/master/index.js#L941

According to the "contract" this method should never throw a reject() -- yet it does here:

https://github.com/flywheelsports/hydra/blob/master/index.js#L973

[cjus]

@sjmcdowall correct. ;-) Doc should be corrected to reflect what really happens.

[sjmcdowall]

Fixed by pr # 181