zsv help 2json returns exit code 5

[iamazeem]

Unlike other commands, zsv help 2json returns an exit code 5 whereas others return 0.
zsv help 2json should also return 0 to be consistent with the rest.

CLI:

$ zsv version
zsv version 0.3.8-alpha (lib 0.3.8-alpha)

$ zsv help 2json
2json: streaming CSV to json converter, or sqlite3 db to JSON converter

Usage: 
   2json [input.csv] [options]
   2json --from-db <sqlite3_filename> [options]

Options:
  -h, --help
  -o, --output <filename>       : output to specified filename
  --compact                     : output compact JSON
  --from-db                     : input is sqlite3 database
  --db-table <table_name>       : name of table in input database to convert
  --object                      : output as array of objects
  --no-empty                    : omit empty properties (only with --object)
  --database                    : output in database schema
  --no-header                   : treat the header row as a data row
  --index <name on expr>        : add index to database schema
  --unique-index <name on expr> : add unique index to database schema

$ echo $?
5

Screenshot:

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OS: Ubuntu 22.04 LTS
zsv: 0.3.8-alpha

[liquidaty]

fixed