Update aaryan.json

I was an idiot and forgot the txt bit

domains/aaryan.json

@@ -12,6 +12,9 @@
         "MX": [
             "mx1.improvmx.com",
             "mx2.improvmx.com"
+        ],
+        "TXT": [
+            "v=spf1 include:spf.improvmx.com ~all"
         ]
     }
 }