Backward compatible fixes for previous release.#951

oleksandr-mykhailenko merged 2 commits intomastermailgun/mailgun-php:masterfrom

DE-1745-mailgun-sdk-mailgun-webhooks-bc-in-v-4-3-7mailgun/mailgun-php:DE-1745-mailgun-sdk-mailgun-webhooks-bc-in-v-4-3-7Copy head branch name to clipboard