修改composer

composer.json

@@ -7,7 +7,7 @@
     "require": {
         "php": ">=7.0.0",
         "dingo/api": "2.0.*@dev",
-        "doctrine/dbal": "^2.7",
+        "doctrine/dbal": "^2.5",
         "dsiddharth2/php-zxing": "^1.0",
         "fideloper/proxy": "~3.3",
         "intervention/image": "^2.4",