fix(exceptions): Add missing ExceptionHandler dependency (#63)

Author: Log1x

composer.json

@@ -48,6 +48,7 @@
     "illuminate/view": "^7.0",
     "league/flysystem": "^1.0",
     "roots/support": "dev-master",
+    "symfony/error-handler": "^5.0",
     "symfony/var-dumper": "^5.0"
   },
   "require-dev": {