add composer file and change read me

Author: tureki

composer.json

@@ -9,7 +9,7 @@
 "homepage": "https://github.com/tureki"
 }],
 "require": {
-"php": ">=5.2.0",
+"php": ">=5.2.0"
 },
 "autoload": {
 "psr-0": {