Added "abandoned" flag

Have not and will no longer update Zend Framework (now Laminas) packages. Have not worked with them for quite some time. 

- I noticed this one is used a fair amount of time. Open a PR stating you wish to inherit this project and I'll update it recommending your package

Author: rkeet

composer.json

@@ -36,5 +36,6 @@
     "classmap": [
       "src/Module.php"
     ]
-  }
-}
+  },
+  "abandoned": true
+}