Allow base path to be changed

[Koenvh1]

Microsoft has been steadily moving to its Microsoft Graph API It unifies OneDrive access between the consumer OneDrive and OneDrive for Business.

The OneDrive API still works roughly the same way as before, only with https://graph.microsoft.com as base path. It would be nice to be able to see a transition to the Microsoft Graph API, so OneDrive for Business is also supported.

I forked the project to fully switch to the Microsoft Graph API, which you can find here: https://github.com/Koenvh1/onedrive-client