Update the credits

Author: weynhamz

README.md

@@ -37,3 +37,4 @@ Acknowledgements
 * [Snapi](https://github.com/sanpii) for composer support.
 * [DeMarko](https://github.com/DeMarko) for memory limit support.
 * [Sander Marechal](https://github.com/sandermarechal) for improve console support
+* [Mark Wu](https://github.com/markwu) for building a stand-alone PHAR executable