Display both USD and CA available balances

Even accounts that indicate that their currency is CAD can have USD
positions and cash balances.  So when displaying the cash balance,
display both CAD and USD balances.

Signed-off-by: Brian J. Murrell <brian@interlinx.bc.ca>

Author: brianjmurrell

README.md

@@ -151,9 +151,9 @@ class WSApiTest:
 
                 # Cash and positions balances
                 balances = ws.get_account_balances(account['id'])
-                cash_balance_key = 'sec-c-usd' if account['currency'] == 'USD' else 'sec-c-cad'
-                cash_balance = float(balances.get(cash_balance_key, 0))
-                print(f"  Available (cash) balance: {cash_balance} {account['currency']}")
+                for cash_balance_key in [ 'sec-c-usd', 'sec-c-cad']:
+                    cash_balance = float(balances.get(cash_balance_key, 0))
+                    print(f"  Available (cash) balance: {cash_balance} {cash_balance_key.split('-')[-1].upper()}")
 
                 if len(balances) > 1:
                     print("  Assets:")
@@ -199,4 +199,4 @@ if __name__ == "__main__":
 Projects Using It
 -----------------
 
-- [wealthgrabber](https://github.com/ebastos/wealthgrabber) - Wealthsimple portfolio analytics
+- [wealthgrabber](https://github.com/ebastos/wealthgrabber) - Wealthsimple portfolio analytics