Add example of converting float to int to Readme

Readme.md

@@ -78,7 +78,7 @@ If you would like to pay fees in cUSD, set the gas price manually:
 stable_token = kit.base_wrapper.create_and_get_contract_by_name('StableToken')
 gas_price_contract = kit.base_wrapper.create_and_get_contract_by_name('GasPriceMinimum')
 gas_price_minimum = gas_price_contract.get_gas_price_minimum(stable_token.address)
-gas_price = gas_price_minimum * 1.3 # Wiggle room if gas price minimum changes before tx is sent
+gas_price = int(gas_price_minimum * 1.3) # Wiggle room if gas price minimum changes before tx is sent
 kit.wallet_fee_currency = stable_token.address # Default to paying fees in cUSD
 kit.wallet_gas_price = gas_price