Add coverage folder to gitignore
Add coverage folder to gitignore

spytz/yandex-php-library,nixsolutions/yandex-php-library,nixsolutions/yandex-php-library,AntonShevchuk/yandex-sdk-php,loginwashere/yandex-php-library,loginwashere/yandex-php-library,spytz/yandex-php-library,AntonShevchuk/yandex-sdk-php