Use port in build_url function

stechuhr_client/client.py

@@ -163,7 +163,7 @@ def build_url(config, endpoint: str = "") -> str:
     if not config["server"]["https"]:
         protocol = "http"
 
-    url = '{}://{}/{}'.format(protocol, config["server"]["address"].rstrip("/"), endpoint.lstrip("/"))
+    url = '{}://{}:{}/{}'.format(protocol, config["server"]["address"].rstrip("/"), config["server"]["port"], endpoint.lstrip("/"))
     return url