Add bump-after-update option to composer configuration (#134)

See https://getcomposer.org/doc/06-config.md#bump-after-update

Author: vjik

composer.json

@@ -50,6 +50,7 @@
     },
     "config": {
         "sort-packages": true,
+        "bump-after-update": "dev",
         "allow-plugins": {
             "infection/extension-installer": true,
             "composer/package-versions-deprecated": true