Add erc20 token configurations

Author: mohanson

pleth/config.py

@@ -5,6 +5,7 @@
 
 develop = pleth.objectdict.ObjectDict({
     'chain_id': 1337,
+    'erc20': {},
     'gas_base_fee': 21000,
     'rpc': {
         'url': 'http://127.0.0.1:8545',
@@ -14,6 +15,10 @@
 
 mainnet = pleth.objectdict.ObjectDict({
     'chain_id': 1,
+    'erc20': {
+        'usdc': '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
+        'usdt': '0xdAC17F958D2ee523a2206206994597C13D831ec7',
+    },
     'gas_base_fee': 21000,
     'rpc': {
         'url': 'https://eth.drpc.org',
@@ -23,6 +28,7 @@
 
 testnet = pleth.objectdict.ObjectDict({
     'chain_id': 11155111,
+    'erc20': {},
     'gas_base_fee': 21000,
     'rpc': {
         'url': 'https://rpc.sepolia.org',