testnet: update axone rpcs

Signed-off-by: Whyme <[email protected]>

chains/mainnet/okp4.json

@@ -1,19 +1,23 @@
 {
-    "chain_name": "okp4",
-    "api": ["https://okp4-testnet-api.polkachu.com", "https://okp4-testnet.api.kjnodes.com", "https://api-okp4.nodeist.net"],
-    "rpc": ["https://okp4-testnet-rpc.polkachu.com", "https://okp4-testnet.rpc.kjnodes.com", "https://rpc-okp4.nodeist.net"],
+    "chain_name": "axone",
+    "api": [
+        {"provider": "polkachu.com", "address": "https://axone-testnet-api.polkachu.com"}
+    ],
+    "rpc": [
+        {"provider": "polkachu.com", "address": "https://axone-testnet-rpc.polkachu.com"}
+    ],
     "snapshot_provider": "",
     "sdk_version": "0.46.6",
     "coin_type": "118",
     "min_tx_fee": "8000",
-    "addr_prefix": "okp4",
-    "logo": "/logos/okp4.svg",
+    "addr_prefix": "axone.png",
+    "logo": "/logos/axone.png",
     "keplr_features": ["ibc-transfer", "ibc-go"],
     "theme_color": "#181c49",
     "assets": [{
-        "base": "uknow",
-        "symbol": "KNOW",
+        "base": "uaxone",
+        "symbol": "AXONE",
         "exponent": "6",
-        "logo": "/logos/okp4.svg"
+        "logo": "/logos/axone.png"
     }]
 }