replace LoadAccount with literal constructor

pkg/bbgo/account.go

@@ -1,7 +1,6 @@
 package bbgo
 
 import (
-	"context"
 	"sync"
 
 	"github.com/c9s/bbgo/pkg/types"
@@ -12,18 +11,9 @@ import (
 
 type Account struct {
 	sync.Mutex
-
 	Balances map[string]types.Balance
 }
 
-// TODO: rewrite this as NewAccount(map balances)
-func LoadAccount(ctx context.Context, exchange types.Exchange) (*Account, error) {
-	balances, err := exchange.QueryAccountBalances(ctx)
-	return &Account{
-		Balances: balances,
-	}, err
-}
-
 func (a *Account) handleBalanceUpdates(balances map[string]types.Balance) {
 	a.Lock()
 	defer a.Unlock()

pkg/bbgo/trader.go

@@ -133,11 +133,13 @@ func (environ *Environment) Init(ctx context.Context) (err error) {
 			session.LastPrices[symbol] = currentPrice
 		}
 
-		session.Account, err = LoadAccount(ctx, session.Exchange)
+		balances, err := session.Exchange.QueryAccountBalances(ctx)
 		if err != nil {
 			return err
 		}
 
+		session.Account = &Account{ Balances: balances }
+
 		session.Stream = session.Exchange.NewStream()
 
 		session.Account.BindStream(session.Stream)