add #4

why is this hardcoded anyway

Author: Techbot121

src/server/redirects.js

@@ -14,6 +14,7 @@ const joinURLs = {
   eu1: "195.154.166.219:27015",
   eu2: "176.9.65.121:27015",
   eu3: "116.202.33.7:27015",
+  eu4: "116.202.33.7:27015",
   us1: "66.42.103.116:27015",
   hl2coop: "94.23.170.2:27016",
   hl2dm: "94.23.170.2:27015",