Added myself as contributor to the composer.json.

Author: Martin Brecht-Precht

composer.json

@@ -15,6 +15,12 @@
       "name": "Ryo Ito",
       "email": "ritou.06@gmail.com",
       "homepage": "http://xri.net/=ritou/(+blog)"
+    },
+    {
+      "name": "Martin Brecht-Precht",
+      "email": "mb@markenwerk.net",
+      "homepage": "http://markenwerk.net",
+      "role": "Contributor"
     }
   ],
   "autoload": {
@@ -25,7 +31,7 @@
   "require": {
     "php": ">=5.2"
   },
-  "require-dev":{
+  "require-dev": {
     "phpunit/phpunit": "~4.8"
   }
 }