Merge pull request #952 from mailgun/DE-1744-mailgun-sdk-query-account-metrics-dimension-support

Added updated list of dimensions

Merge pull request #951 from mailgun/DE-1745-mailgun-sdk-mailgun-webhooks-bc-in-v-4-3-7

Backward compatible fixes for previous release.

Backward compatible fixes for previous release.

Merge pull request #946 from mailgun/prepare-release

test another fix

Merge commit 'refs/pull/819/head' of github.com:mailgun/mailgun-php into prepare-release

commit

Update src/Mailgun.php

Merge commit 'refs/pull/937/head' of github.com:mailgun/mailgun-php into prepare-release

Merge pull request #945 from mailgun/prepare-release

Merge commit 'refs/pull/934/head' of github.com:mailgun/mailgun-php into prepare-release

test another fix

Merge commit 'refs/pull/939/head' of github.com:mailgun/mailgun-php into prepare-release