fix mygb -h print error

mygb.sh -h                                                                                                      (11-import-one-group↑1|✔)
My GitLab Backup

mygb.sh <command> [options]

Command :
  init : create the configuration file
  export : export from GitLab
  import : import to GitLab

Options :
  -h                : print help
  -c path/to/conf   : read one config file
  -p path/to/projet : export the projet
  -g path/to/group  : export the group and is subgroups and projects
  -a                : export all my group and subgroup
  -d                : launch script with the dry-run mode

ERROR : Bad usage
End with code 1