Merge pull request #7 from appuio/renovate/monolog-monolog-2.x

Update dependency monolog/monolog to 2.8.*

Author: chrira

app/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "monolog/monolog": "2.1.*"
+        "monolog/monolog": "2.8.*"
     }
 }