fix endpoint (#208)

testnets/initia/chain.json

@@ -128,7 +128,7 @@
         "provider": "Initia Labs"
       },
       {
-        "address": "skip-grpc.testnet.initia.xyz:443",
+        "address": "grpc-skip.testnet.initia.xyz:443",
         "provider": "Initia Labs",
         "authorizedUser": "skip"
       }