Update AUTHORS.md

Author: Papakai

AUTHORS.md

@@ -1,5 +1,5 @@
 > ⚠ This document _only_ reflects the responsible developers at HEXONET GmbH. For a list of MUCH-APPRECIATED CONTRIBUTORS -- people who helped developing and extending this library, applying patches, adding helpful comments
 and thus generally made it that much better, see [GitHub's list of contributors](https://github.com/hexonet/python-sdk/contributors).
 
-* [Anthony Schneider](//github.com/isharky) - Original Implementation
-* [Kai Schwarz](//github.com/papakai) - Full Review
+* [Anthony Schneider](//github.com/anthonyschn) - Original Implementation
+* [Kai Schwarz](//github.com/papakai) - Full Review