Merge pull request #288 from thrawn01/thrawn/develop

Added CaptureCurlOutput

Merge pull request #287 from thrawn01/thrawn/develop

Added AddOverrideHeader()

Merge pull request #286 from OFFLINE-GmbH/move-url-validation

Changed url validation

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Merge pull request #272 from mailgun/bump-version

Bump version

Merge pull request #265 from thrawn01/thrawn/val-result

Added result to v4 validation response

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Merge pull request #256 from thrawn01/thrawn/develop

MockServer now locks internal resources

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Update CHANGELOG