v2.0.0

Upgrade and Fixes (#8)

* feat: added version to headers

* feat: update all apis

* feat: whatsapp api

* feat: added examples

* test: phpunit 10 support

* fix: update schema rules

* test: phpunit 10 compatibility

* test: fix broken test

* fix: added vk schmea

* test: fix broken test

* ci: php unit

* ci: php test unit for specific version

* ci: extend support

* ci: php 7.3

* fix: update pay.status api

* fix: errored api

* test: fix test dependency