Update changelog.txt (#960)

2017-11-27 18:23:02 -08:00 · 2017-11-27 18:23:02 -08:00 · bd4d948d2f
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+Windows Azure SDK For PHP 0.5.7, 2017-11-27
+
+- SAS authorization
+- AD support for Media Services
+
 Windows Azure SDK For PHP 0.5.6, 2017-09-22

 - [Azure Storage SDK](https://packagist.org/packages/microsoft/azure-storage) is updated to the 0.19.1 version.