Merge pull request #991 from voxpupuli/freebsd

Add support for FreeBSD 13

Author: ghoneycutt

metadata.json

@@ -74,7 +74,8 @@
     {
       "operatingsystem": "FreeBSD",
       "operatingsystemrelease": [
-        "12"
+        "12",
+        "13"
       ]
     },
     {