observer --help result is not complete

[rgyu]

版本号：
REVISION: -00672c3c730c3df6eef3b359eae548d8c2db5ea2
BUILD_BRANCH: master
BUILD_TIME: Jun 22 2021 12:46:28
BUILD_FLAGS: RelWithDebInfo
BUILD_INFO:

重现步骤：

observer --help
observer [OPTIONS]
-h,--help print this help
-z,--zone ZONE zone
-p,--mysql_port PORT mysql port
-P,--rpc_port PORT rpc port
-N,--nodaemon don't run in daemon
-n,--appname APPNAME application name
-c,--cluster_id ID cluster id
-d,--data_dir DIR OceanBase data directory
-i,--devname DEV net dev interface
-o,--optstr OPTSTR extra options string
-r,--rs_list RS_LIST root service list
-l,--log_level LOG_LEVEL server log level
-6,--ipv6 USE_IPV6 server use ipv6 address
-m,--mode MODE server mode
-f,--scn flashback_scn

这里的输出信息不全，可以再加一条：
-V --version print out version information

[longdafeng]

Thanks for your response.

We will fix this issue in this release or the next release.

In our plan, we will release one version per month.