Incorrect documentation for git source

[grawlinson]

nvchecker fails to parse a config.toml file with layout as defined by the current git documentation:

$ cat config.toml

[plasma-pass-git]
source = "git"
url = "https://invent.kde.org/plasma/plasma-pass.git"

$ nvchecker -c config.toml

[E 10-06 10:32:08.550 core:330] plasma-pass-git: unexpected error happened error=KeyError('git')
    Traceback (most recent call last):
      File "/usr/lib/python3.8/site-packages/nvchecker/util.py", line 218, in run_one
        version = await self.func(
      File "/usr/lib/python3.8/site-packages/nvchecker_source/git.py", line 9, in get_version
        git = conf['git']
    KeyError: 'git'

The problem lies in the source parser for git, where it defines the remote repository using key=git instead of key=url.

There are two fixes available, either change the documentation to git key or the code to url key.

Thanks for nvchecker, by the way! It's an invaluable bit of software. 👍