[TASK] Make Xheni Myrtaj the new maintainer (#128)

Author: schmidtsabine

composer.json

@@ -13,10 +13,15 @@
     "homepage": "https://www.phplist.com/",
     "license": "AGPL-3.0-or-later",
     "authors": [
+        {
+            "name": "Xheni Myrtaj",
+            "email": "[email protected]",
+            "role": "Maintainer"
+        },
         {
             "name": "Oliver Klee",
             "email": "[email protected]",
-            "role": "Developer"
+            "role": "Former developer"
         }
     ],
     "support": {