Update directory.json (#301)

Author: WheezeNL

directory.json

@@ -51,6 +51,7 @@
   "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",
+  "Dordtse Elektronica Club": "https://www.pi4dec.nl/space/spaceapi.json",
   "East Essex Hackspace": "https://wiki.eehack.space/spaceapi/api.json",
   "Edinburgh Hacklab": "http://spaceapi.edinburghhacklab.com/spaceapi.json",
   "Eigenbaukombinat Halle": "https://spaceapi.eigenbaukombinat.de/status_ebk.json",