Document pep next in --help

[hugovk]

Fixes #52.

Before

❯ pep --help
usage: pep [-h] [-u URL] [-p PR] [--clear-cache] [-n] [-v] [-V] [search ...]

pepotron: CLI to open PEPs in your browser

positional arguments:
  search             PEP number, or Python version for its schedule, or words
                     from title

options:
  -h, --help         show this help message and exit
  -u URL, --url URL  Base URL for PEPs (default: https://peps.python.org)
  -p PR, --pr PR     Open preview for python/peps PR
  --clear-cache      Clear cache before running
  -n, --dry-run      Don't open in browser
  -v, --verbose      Verbose logging
  -V, --version      show program's version number and exit

After

❯ pep --help
usage: pep [-h] [-u URL] [-p PR] [--clear-cache] [-n] [-v] [-V] [search ...]

pepotron: CLI to open PEPs in your browser

positional arguments:
  search             PEP number, or Python version for its schedule, or words
                     from title, or 'next' to find next available PEP number

options:
  -h, --help         show this help message and exit
  -u URL, --url URL  Base URL for PEPs (default: https://peps.python.org)
  -p PR, --pr PR     Open preview for python/peps PR
  --clear-cache      Clear cache before running
  -n, --dry-run      Don't open in browser
  -v, --verbose      Verbose logging
  -V, --version      show program's version number and exit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bf85233) 99.14% compared to head (3213149) 99.14%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files           4        4           
  Lines         233      233           
=======================================
  Hits          231      231           
  Misses          2        2           

Flag	Coverage Δ
macos-latest	99.14% <ø> (ø)
ubuntu-latest	99.14% <ø> (ø)
windows-latest	99.14% <ø> (ø)

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[vstinner]

I would prefer sub-commands such as:

pepotron search "interpreter"
pepotron next

[hugovk]

Hmm, something to consider for the future. I'll merge this now, it improves the current situation.