Update README.md (typicode#1095)

Author: manavm1990

README.md

@@ -123,7 +123,7 @@ Also when doing requests, it's good to know that:
 - If you make POST, PUT, PATCH or DELETE requests, changes will be automatically and safely saved to `db.json` using [lowdb](https://github.com/typicode/lowdb).
 - Your request body JSON should be object enclosed, just like the GET output. (for example `{"name": "Foobar"}`)
 - Id values are not mutable. Any `id` value in the body of your PUT or PATCH request will be ignored. Only a value set in a POST request will be respected, but only if not already taken.
-- A POST, PUT or PATCH request should include a `Content-Type: application/json` header to use the JSON in the request body. Otherwise it will result in a 200 OK but without changes being made to the data.
+- A POST, PUT or PATCH request should include a `Content-Type: application/json` header to use the JSON in the request body. Otherwise it will return a 2XX status code, but without changes being made to the data. 
 
 ## Routes