Add network detail: introduce amoy & sepolia testnet (#20)

* add support for sepolia

* update network detail for polygon

Author: SpaceStation09

info/networks.json

@@ -23,6 +23,11 @@
     "accounts": ["<PRIVATE_KEY>"],
     "chainId": 5
   },
+  "sepolia": {
+    "url": "https://eth-sepolia.g.alchemy.com/v2/<ALCHEMY-PROJECT-ID>",
+    "accounts": ["<PRIVATE_KEY>"],
+    "chainId": 11155111
+  },
   "bsc_test": {
     "url": "https://data-seed-prebsc-1-s1.binance.org:8545",
     "accounts": ["<PRIVATE_KEY>"],
@@ -33,12 +38,12 @@
     "accounts": ["<PRIVATE_KEY>"],
     "chainId": 56
   },
-  "matic_mumbai_test": {
-    "url": "https://polygon-mumbai.g.alchemy.com/v2/<ALCHEMY-PROJECT-ID>",
+  "polygon_amoy": {
+    "url": "https://polygon-amoy.g.alchemy.com/v2/<ALCHEMY-PROJECT-ID>",
     "accounts": ["<PRIVATE_KEY>"],
-    "chainId": 80001
+    "chainId": 80002
   },
-  "matic": {
+  "polygon": {
     "url": "https://polygon-rpc.com/",
     "accounts": ["<PRIVATE_KEY>"],
     "chainId": 137