Update composer.json

Author: CJayHe

composer.json

@@ -22,6 +22,7 @@
         }
     },
     "require": {
-        "symfony/framework-bundle": ">=4.4"
+        "symfony/framework-bundle": ">=4.4",
+        "phpoffice/phpspreadsheet": "1.18.*"
     }
 }