Add Decentrala.org space in Belgrade (#292)

Co-authored-by: coja <coja@dmz.rs>

Author: coj4tuX

directory.json

@@ -46,6 +46,7 @@
   "Coredump": "https://status.crdmp.ch/",
   "C-Hack Calw": "https://spaceapi.c-hack.de",
   "Das Labor": "https://das-labor.org/status/api",
+  "Decentrala": "https://spaceapi.decentrala.org/api/spaceapi",
   "DevLoL": "https://devlol.org/status/hackerspaceapi/",
   "dezentrale": "https://api.dezentrale.cloud/spaceapi/v14",
   "Do-It-Yourself-Werkstatt Wilhelmshaven e.V.": "https://status.diyww.de/status.json",