Feature Request

Is your feature request related to a problem? Please describe

I don't understand why we should specify true in the .count() method.
If you call, it means you want it.
If you don't specify it, you get this error:

Cannot read property 'toString' of undefined at GraphRequest.count

PS: I'm not using typescript and I'm not the only one ;)

Describe the solution you'd like

Default the param to true here:

That way you stay compatible with previous version and in the new version this param is optional.