Update eip155-140.json (#7608)

Author: Eteriaio

_data/chains/eip155-140.json

@@ -13,5 +13,12 @@
   "infoURL": "https://eteria.io",
   "shortName": "ERA",
   "chainId": 140,
-  "networkId": 140
+  "networkId": 140,
+  "explorers": [
+    {
+      "name": "eteriascan",
+      "url": "https://explorer.eteria.io",
+      "standard": "EIP3091"
+    }
+  ]
 }