PSR7 cleanup.

README.md

 * [Buzz](https://github.com/kriswallsmith/Buzz) - Another HTTP client.
 * [Guzzle]( https://github.com/guzzle/guzzle) - A comprehensive HTTP client.
 * [HTTPlug](http://httplug.io) - An HTTP client abstraction without binding to a specific implementation.
-* [Nyholm-psr7](https://github.com/Nyholm/psr7) - A super lightweight PSR-7 implementation. Very strict and very fast.
+* [Nyholm PSR-7](https://github.com/Nyholm/psr7) - A super lightweight PSR-7 implementation. Very strict and very fast.
 * [PHP VCR](https://php-vcr.github.io/) - A library for recording and replaying HTTP requests.
 * [Requests](https://github.com/rmccue/Requests) - A simple HTTP library.
 * [Retrofit](https://github.com/tebru/retrofit-php) - A library to ease creation of REST API clients.
 ### Middlewares
 *Libraries for building application using middlewares.*
 
-* [PSR7-Middlewares](https://github.com/oscarotero/psr7-middlewares) - Inspiring collection of handy middlewares.
+* [PSR-7 Middlewares](https://github.com/oscarotero/psr7-middlewares) - Inspiring collection of handy middlewares.
 * [Relay](https://github.com/relayphp/Relay.Relay) - A PHP 5.5 PSR-7 middleware dispatcher.
 * [Stack](https://github.com/stackphp) - A library of stackable middleware for Symfony.
 * [Laminas Stratigility](https://github.com/laminas/laminas-stratigility) - Middleware for PHP built on top of PSR-7.