Google-map-react: Improvement, define what libraries you want to use.

[SSinkus]

Hello,

First of all great job with this project. We are using it, but I missed one thing that I can define what libraries I want to use like example:
geometry,drawing,places and so on since like example places are used for autocomplete.
i went to google_maps_loader.jsx line 76:
var libraries = heatmapLibrary ? '&libraries=visualization' : '';
So to have extra property for libraries would be nice feature, at this moment no other options except load needed libraries in header.

Br.

[SSinkus]

you can pass it via bootstrapURLKeys.