add version command

pkg/cmd/sync.go

@@ -100,10 +100,6 @@ var SyncCmd = &cobra.Command{
 
 		sessions := environ.SelectSessions(selectedSessions...)
 		for _, session := range sessions {
-			if err := session.Init(ctx, environ) ; err != nil {
-				return err
-			}
-
 			if err := environ.SyncSession(ctx, session, defaultSymbols...); err != nil {
 				return err
 			}

pkg/cmd/version.go

@@ -0,0 +1,24 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/c9s/bbgo/pkg/version"
+)
+
+func init() {
+	// VersionCmd.Flags().String("session", "", "the exchange session name for sync")
+	RootCmd.AddCommand(VersionCmd)
+}
+
+var VersionCmd = &cobra.Command{
+	Use:          "version",
+	Short:        "show version name",
+	SilenceUsage: true,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println(version.Version)
+	},
+}
+