chore: update license tag

Author: pariaspe

package.xml

@@ -7,7 +7,7 @@
 
   <maintainer email="cvar.upm3@gmail.com">CVAR-UPM</maintainer>
 
-  <license>BDS-3</license>
+  <license>BSD-3-Clause</license>
 
   <author email="r.psegui@upm.es">Rafael Perez-Segui</author>
   <author email="santiago.tapia@upm.es">Santiago Tapia-Fernandez</author>