Updated docs, composer.json and other things to mention and use PHP 5.4

README.md

@@ -31,7 +31,7 @@ DIRECTORY STRUCTURE
 REQUIREMENTS
 ------------
 
-The minimum requirement by Yii is that your Web server supports PHP 5.3.?.
+The minimum requirement by Yii is that your Web server supports PHP 5.4.0.
 
 In order for captcha to work you need either GD2 extension or ImageMagick PHP extension.
 

composer.json

@@ -14,7 +14,7 @@
 	},
 	"minimum-stability": "dev",
 	"require": {
-		"php": ">=5.3.0",
+		"php": ">=5.4.0",
 		"yiisoft/yii2": "dev-master",
 		"yiisoft/yii2-composer": "dev-master"
 	},