Update PHPMD min version

JeroenDeDauw · JeroenDeDauw · commit ccb1622f6cf2 · 2015-10-01T00:32:07.000+02:00
diff --git a/composer.json b/composer.json
@@ -28,7 +28,7 @@
 	},
 	"require-dev": {
 		"squizlabs/php_codesniffer": "~2.1",
-		"phpmd/phpmd": "~2.1"
+		"phpmd/phpmd": "~2.3"
 	},
 	"autoload": {
 		"files" : [
