Update @lukechilds server address

electrum/servers.json

@@ -118,7 +118,7 @@
         "t": "50001",
         "version": "1.4.2"
     },
-    "bitcoin.lukechilds.co": {
+    "bitcoin.lu.ke": {
         "pruning": "-",
         "s": "50002",
         "t": "50001",