XML Namespace Warning

[weinerm]

I'm getting the following error on PHP 7 when creating a transaction via the API

simplexml_load_string(): namespace warning : xmlns: URI AnetApi/xml/v1/schema/AnetApiSchema.xsd is not absolute

The XML namespace in the request is clearly not absolute in createTransactionWithProfile.php: xmlns="AnetApi/xml/v1/schema/AnetApiSchema.xsd"

Seems to be the same issue as referenced in the SDK here: https://github.com/AuthorizeNet/sdk-php/issues/135