Update the short description.
Update the short description of "run" subcommand.
Change the default port to "8901".
Update the short description of "-n" option.'
Remove a needless comment
Replace the information of Kompl with constants.
Show error messages.
Change the message for error occured on running the server.
Update the short description of "build" subcommand.
Show error messages.
Merge branch 'feature/refactor-command'