fixed typo in readme

Author: oscarotero

README.md

@@ -12,7 +12,7 @@ Middleware to normalize the trailing slash of the uri path. By default removes t
 ## Requirements
 
 * PHP >= 7.0
-* A [PSR-7](https://packagist.org/providers/psr/http-message-implementation) http mesage implementation ([Diactoros](https://github.com/zendframework/zend-diactoros), [Guzzle](https://github.com/guzzle/psr7), [Slim](https://github.com/slimphp/Slim), etc...)
+* A [PSR-7](https://packagist.org/providers/psr/http-message-implementation) http message implementation ([Diactoros](https://github.com/zendframework/zend-diactoros), [Guzzle](https://github.com/guzzle/psr7), [Slim](https://github.com/slimphp/Slim), etc...)
 * A [PSR-15](https://github.com/http-interop/http-middleware) middleware dispatcher ([Middleman](https://github.com/mindplay-dk/middleman), etc...)
 
 ## Installation