refactor: add short flag -t for --timeout.command

- `gossh fetch` flags have been changed:
  Before: `-t, --tmp-dir string     directory of target hosts for storing temporary zip file (default "$HOME")`
  After: `-T, --tmp-dir string     directory for storing temporary zip file on target hosts, only useful if the -z flag is used (default "$HOME")`

- Add short flag `-t` for `--timeout.command`:
  Before: `--timeout.command int`
  After: `-t, --timeout.command int`

internal/cmd/fetch.go

@@ -87,15 +87,16 @@ func init() {
 		"local directory that files/dirs from target hosts will be copied to",
 	)
 
-	fetchCmd.Flags().StringVarP(&tmpDir, "tmp-dir", "t", "$HOME",
-		"directory of target hosts for storing temporary zip file",
-	)
-
 	fetchCmd.Flags().BoolVarP(
 		&enableZipFiles,
 		"zip",
 		"z",
 		false,
 		"enable zip files ('zip' must be installed on target hosts)",
 	)
+
+	fetchCmd.Flags().StringVarP(&tmpDir, "tmp-dir", "T", "$HOME",
+		`directory for storing temporary zip file on target hosts, 
+only useful if the -z flag is used`,
+	)
 }

internal/pkg/configflags/timeout.go

@@ -48,12 +48,12 @@ func NewTimeout() *Timeout {
 
 // AddFlagsTo ...
 func (t *Timeout) AddFlagsTo(flags *pflag.FlagSet) {
+	flags.IntVarP(&t.Command, flagTimeoutCommand, "t", t.Command,
+		`timeout seconds for handling each target host`)
 	flags.IntVarP(&t.Task, flagTimeoutTask, "", t.Task,
 		"timeout seconds for the entire gossh task")
 	flags.IntVarP(&t.Conn, flagTimeoutConn, "", t.Conn,
 		"timeout seconds for connecting each target host")
-	flags.IntVarP(&t.Command, flagTimeoutCommand, "", t.Command,
-		`timeout seconds for handling each target host`)
 }
 
 // Complete ...