Update license and CI workflow

.gitlab-ci.yml

 Deploy:
   script:
     - curl -XPOST -H'content-type:application/json' "https://packagist.org/api/update-package?username=${PACKAGIST_USERNAME}&apiToken=${PACKAGIST_API_TOKEN}" -d'{"repository":{"url":"'${CI_PROJECT_URL}'"}}'
+  only:
+    - tags
+    - triggers
+    - schedules

composer.json

@@ -4,7 +4,7 @@
     "type": "composer-plugin",
     "keywords": ["Development"],
     "homepage": "https://gitlab.lakedrops.com/composer/plugin/dorgflow",
-    "license": "GPL-2.0+",
+    "license": "GPL-2.0-or-later",
     "authors": [
         {
             "name": "Jürgen Haas",
@@ -31,8 +31,6 @@
     },
     "require-dev": {
         "composer/composer": "^1.5.0",
-        "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3",
-        "drupal/coder": "^8.2",
         "phpunit/phpunit": "^4.8.0"
     },
     "minimum-stability": "dev",