Set correct namespace in composer.json

Author: DanielGSoftware

composer.json

@@ -12,10 +12,10 @@
     }],
     "autoload": {
         "psr-4": {
-            "Postbode\\": "src"
+            "PostbodeApi\\": "src"
         }
     },
     "require-dev": {
         "phpunit/phpunit": "^8"
     }
-}
+}