Change MX priority values to integer type

Updated MX priority values to be integers.

domains/spdly.json

@@ -13,15 +13,15 @@
         "MX": [
             {
                 "target": "mx.zoho.in",
-                "priority": "10"
+                "priority": 10
             },
             {
                 "target": "mx2.zoho.in",
-                "priority": "20"
+                "priority": 20
             },
             {
                 "target": "mx3.zoho.in",
-                "priority": "50"
+                "priority": 50
             }
         ]
     }