Fixed autoload issue

composer.json

@@ -24,13 +24,18 @@
             "role": "Developer"
         }
     ],
+    "autoload": {
+		"psr-4": {
+			"Youen\\UsersMap\\": "src/"
+		}
+	},
     "extra": {
         "flarum-extension": {
             "title": "Users Map",
             "category": "feature",
             "icon": {
                 "name": "fas fa-map-marked-alt",
-                "backgroundColor": "purple",
+                "backgroundColor": "darkgreen",
                 "color": "white"
             }
         }