maxapi: drop unused mustParseURL

pkg/exchange/max/maxapi/order.go

@@ -4,20 +4,10 @@ package max
 //go:generate -command PostRequest requestgen -method POST
 
 import (
-	"net/url"
-
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
 )
 
-func mustParseURL(s string) *url.URL {
-	u, err := url.Parse(s)
-	if err != nil {
-		panic(err)
-	}
-	return u
-}
-
 type WalletType string
 
 const (