Typo fixes in README (typicode#817)

wil -> will

Author: elitree

README.md

@@ -95,7 +95,7 @@ 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 wil be ignored. Only a value set in a POST request wil be respected, but only if not already taken.
+- 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.
 
 ## Install