V2 of the library is using Wrike API V3 instead of V4

[dan-dima]

In the docs it says that the major version V2 is using Wrike API V4, but after looking at the AbstractApi class in the v2.x branch I noticed that Wrike API V3 is still used:

abstract class AbstractApi implements ApiInterface
{
    const BASE_URI = 'https://www.wrike.com/api/v3/';

Am I missing something?
I'm trying to get the library to use V4 without upgrading to PHP 7.1.

Thank you!

[jacobmc]

I realize it's been a year since this issue was created. I'm experiencing the same issue and Wrike has now shutdown v3 of the API. Is this still being worked on and maintained? Is there a fix apart from manually editing the BASE_URI constant?