Update AUTHORS.md.

Author: Miguel Labayen

AUTHORS.md

@@ -25,3 +25,4 @@ Contributors
 * Calin Pirtea — [@pcalin](https://github.com/pcalin)
 * Osiris Pedroso — [@opedroso](https://github.com/opedroso)
 * Mike Miller — [@mikepmiller](https://github.com/mikepmiller)
+* Miguel Labayen — [@milabtom](https://github.com/milabtom)