Added some lines in composer.json

Author: gevorgmelkumyan

composer.json

@@ -9,5 +9,12 @@
             "email": "[email protected]"
         }
     ],
-    "require": {}
+    "require": {
+        "php": ">=7.1.0"
+    },
+    "autoload": {
+        "psr-0": {
+            "GM": "src/"
+        }
+    }
 }