Support for comma separated multiple version requirements

[radusuciu]

Hi, thanks for the great project -- really awesome tool!

I encountered an error because in my pyproject.toml I specify some dependency ranges using the comma separated syntax which is supported by poetry as well as pdm and documented in PEP440. For example, this is a valid PDM pyproject.toml:

[project]
name = "test_pcu"
version="0.0.1"
dependencies = [
    "svglib>=1.5.0,<2.0.0",
]
requires-python = ">=3.11"
license = {text = "MIT"}

However, pip-check-updates fails to parse this, giving this error:

Traceback (most recent call last):
  File "/usr/local/bin/pcu", line 8, in <module>
    sys.exit(run())
             ^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/__main__.py", line 70, in run
    deps = load_dependencies(req_path, not no_recursive, extra)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/parser.py", line 167, in load_dependencies
    load_toml(deps, f, p, pyproject=True, extras=extras)
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/parser.py", line 111, in load_toml
    packages = parse_requirements_lines(config.get(package_key, []))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/parser.py", line 101, in parse_requirements_lines
    requirements = [
                   ^
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/parser.py", line 102, in <listcomp>
    get_current_version(clean_requirements_line(requirement_line))
  File "/usr/local/lib/python3.11/site-packages/pip_check_updates/version.py", line 52, in get_current_version
    name, current_version = split_line
    ^^^^^^^^^^^^^^^^^^^^^
ValueError: too many values to unpack (expected 2)

[zehengl]

@all-contributors please add @radusuciu for bug

[allcontributors]

@zehengl

I've put up a pull request to add @radusuciu! 🎉

[radusuciu]

Workaround in the meantime: specify dependencies with ~= instead.