fix command line option "--width"

[haochenx]

when specifying --width, i'm getting the following error:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/opt/homebrew/lib/python3.11/site-packages/ansitoimg/__main__.py", line 6, in <module>
    cli()
  File "/opt/homebrew/lib/python3.11/site-packages/ansitoimg/__init__.py", line 79, in cli
    ansiToSVG(ansi, args.output, args.theme, width=width, title=args.title)
  File "/opt/homebrew/lib/python3.11/site-packages/ansitoimg/render.py", line 79, in ansiToSVG
    console = _doRichRender(ansiText, _resolveWidth(wide, width))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/ansitoimg/render.py", line 23, in _doRichRender
    console.print(richText)
  File "/opt/homebrew/lib/python3.11/site-packages/rich/console.py", line 1694, in print
    extend(render(renderable, render_options))
  File "/opt/homebrew/lib/python3.11/site-packages/rich/console.py", line 1299, in render
    if _options.max_width < 1:
       ^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'str' and 'int'

This PR attempts to fix it.

[FredHappyface]

Hi thanks for this, would it be possible to do the int cast when we parse the args?

[haochenx]

would it be possible to do the int cast when we parse the args?

Make sense. I just revised the PR.

[FredHappyface]

Awesome stuff, thank you so much for that 😄

[haochenx]

Thanks!