Downgraded `webmozart/assert` package to support ultron as ultron was using old version of this package.

Author: Cerlin

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "firebase/php-jwt": "^4.0",
         "guzzlehttp/guzzle": "^6.2",
-        "webmozart/assert": "^1.2"
+        "webmozart/assert": "^1.0"
     },
     "require-dev": {
         "symfony/var-dumper": "^3.2",