Update README.md

README.md

@@ -77,7 +77,7 @@ curl -X POST http://localhost.daplie.me:3000 \
   -H 'X-Forwarded-Proto: https' \
   -H 'Content-Type: application/json' \
   -d '{
-    domain: 'example.com'
+    "domain": "example.com"
   }'
 ```