added autoload

The parameter is needed to get this class working properly with composer as of the moment I am getting an error that the class can not be found.
Added by CodeAlDente.

Co-Authored-By: Code al Dente <[email protected]>

Author: imtiazmahbub

composer.json

@@ -18,5 +18,8 @@
     ],
     "require": {
         "php": "^5.3.3 || ^7.0"
+    },
+    "autoload": {
+        "classmap": ["ArrayToTextTable.php"]
     }
 }