Update domain CNAME to GitHub Pages

Updated CNAME record to use lowercase domain.

domains/sheshank.json

@@ -1,8 +1,8 @@
 {
-    "owner": {
-        "username": "Dachepally-Sheshank"
-    },
-    "records": {
-        "CNAME": "Dachepally-Sheshank.github.io"
-    }
+  "owner": {
+    "username": "Dachepally-Sheshank"
+  },
+  "records": {
+    "CNAME": "dachepally-sheshank.github.io"
+  }
 }