adjure => adhere

Author: WyriHaximus

README.md

@@ -655,7 +655,7 @@ passed explicitly.
 ### Middleware
 
 Middleware can be added to the server using [`MiddlewareRunner`](src/MiddlewareRunner.php)
-instead of the `callable`. A middleware is expected to adjure the following rules:
+instead of the `callable`. A middleware is expected to adhere the following rules:
 
 * It is a `callable`.
 * It accepts `ServerRequestInterface` as first argument and optional `callable` as second argument.