fix: update to monolog 2.0 #9

Author: grkamil

composer.json

@@ -9,7 +9,7 @@
   },
   "require": {
     "php": "^7.1.3",
-    "monolog/monolog": "^1.23",
+    "monolog/monolog": "^1.23|^2.0",
     "laravel/framework": "5.6.*|5.7.*|5.8.*|^6.0"
   },
   "minimum-stability": "dev",