Require monolog 1.26.1 in dev

Author: ruudk

composer.json

@@ -50,6 +50,7 @@
     "require-dev": {
         "doctrine/annotations": "^1.13",
         "doctrine/orm": "^2.5",
+        "monolog/monolog": "^1.26.1",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^0.12.58",
         "phpstan/phpstan-phpunit": "^0.12.11",