license links http -> https

license.txt

@@ -12,7 +12,7 @@ are met:
       distribution.
     * Neither the names of the Naval Postgraduate School (NPS)
       Modeling Virtual Environments and Simulation (MOVES) Institute
-      (http://www.nps.edu and http://www.MovesInstitute.org)
+      (https://www.nps.edu and https://www.MovesInstitute.org)
       nor the names of its contributors may be used to endorse or
       promote products derived from this software without specific
       prior written permission.