[BUGFIX] Validate composer.json

Author: dgorges

composer.json

@@ -3,7 +3,7 @@
   "type": "typo3-cms-extension",
   "description": "Basic SEO features for TYPO3",
   "homepage": "https://github.com/b13/t3ext-seo_basics",
-  "license": ["MIT License"],
+  "license": ["GPL-2.0-or-later"],
   "keywords": ["TYPO3 CMS", "SEO Basics"],
   "support": {
     "issues": "https://github.com/b13/t3ext-seo_basics/issues"