Updated rainbow version

Author: Jack

composer.json

@@ -11,7 +11,7 @@
     "require": {
         "flow/jsonpath": "^0.3.1",
         "phpunit/phpunit": ">=6.0",
-        "justinrainbow/json-schema": "^2.0",
+        "justinrainbow/json-schema": "5.2.1",
         "php": ">=7.0"
     },
     "require-dev": {