PHP-SDK Guzzle is running old version

Hi there, we use your Github PHP-SDK (prismic/php-sdk - Packagist) but it hasn't been maintained and is using an old version of Guzzle 6.x, when is this going to be updated to use Guzzle 7.x as the minimum version?

There's even a Pull Request in the Github repo for these updates but no ones even looked at them.

It's a blocker in allowing us to keep using Prismic.