Update middleware sample code in README

[jlpiedrahita]

Since 1.1.1 options to the middleware are passed as an object. This is not reflected in the main README file where for instance allowInsecureHTTP is still passed as an standalone boolean:

var allowInsecureHTTP = false
var dashboard = new ParseDashboard({
	// Parse Dashboard settings
}, allowInsecureHTTP);

Where the sample code should be in the form:

var options = { allowInsecureHTTP: false };
var dashboard = new ParseDashboard({
	// Parse Dashboard settings
}, options);

The lack of this update was driving me crazy for a couple of hours. Hope this help others.

[flovilmart]

Thanks!