require('toobusy').maxLag(10) does not return a function

[arnaudchenyensu]

When using:

var toobusy = require('toobusy').maxLag(10);

toobusy is not a function. The right way seems to be:

var toobusy = require('toobusy');
toobusy.maxLag(10)

Therefore, the README is misleading IMO.