doc8 reports unnecessary D002 and D004 on Windows line ending

[Lex Li]

It seems that such warnings come from Windows line ending `\r\n`,

'D002 Trailing whitespace'
'D004 Found literal carriage return'

doc8 should properly handle Windows line endings and do not report on such, because not all text files are of UNIX/Linux line ending `\n`.

(Linked to reStructuredText extension for VSCode https://github.com/vscode-restructuredtext/vscode-restructuredtext/issues/84)

[Mateusz Łoskot (mloskot)]

I confirm this issue.

[Laurent Garcin (laurent-garcin)]

I also confirm this issue.

[Rebecca Heineman (becky-e)]

I confirm this issue. It's very troublesome since I do development primarily on a Windows box and all my text files are CR/LF (Although when I check out my files on macOS or Linux they are LF only), but this is quite annoying, especially in Visual Studio Code.

[Deepak Maram (mskdeepak)]

I can confirm this issue.

[Carlos Eduardo (silvacarlose)]

I am also able to confirm this issue. I've worked it around in the following way:

1) Installed a linux subsystem in my Windows machine
2) Installed dos2unix
3) Ran dos2unix in ever single file I was having this issue

When I executed the docs generate command again all the issues disappeared.

More rerefence for docs2unix usage: https://www.computerhope.com/unix/dos2unix.htm

[Adam Hendry (adamhendry)]

+1 I can confirm this bug as well.

For VSCode, a temporary work around is to manually set line endings for `.rst` files to LF.

See: https://github.com/PyCQA/doc8/issues/78