Arbitrum Mainnet Updates (#61)

* update slippage calculation

* add tBTC contract

* update contracts

* hard-code base USDC for backwards compatibility

* version bump

* fix async min_amount_received

Author: Tburm

src/setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="synthetix",
-    version="0.1.16",
+    version="0.1.17",
     description="Synthetix protocol SDK",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",

src/synthetix/contracts/deployments/42161/perpsFactory/PerpsAccountProxy.json

@@ -809,6 +809,8 @@
     }
   ],
   "deployTxnHash": "",
+  "deployTxnBlockNumber": "",
+  "deployTimestamp": "",
   "sourceName": "",
   "contractName": "",
   "deployedOn": "invoke.init_account",