Update to Godot 3.2

[rilifon]

I wonder if this API works with current Godot stable version (3.2). If not, do you have plans to update de API?

[diego-ruiz]

i tried compiling godot 3.2.1 with this module by following these directions: https://github.com/alexfonseka/godot-fmod-integration/blob/master/docs/building.md

works for me

[devrique]

Nowadays is not working with the updated Godot 3.2 branch.
I created a pull request to fix the issue: #33