Support the --stdin-filename option in eslint

[w0rp]

For plugins like my plugin for running linters on Vim text buffers, it's useful to both pass text via stdin, but still specify what the filename for the text you are editing is. This can help some eslint plugins, etc.

Could you support the --stdin-filename option in eslint? The xo wrapper would have to somehow forward this option on to eslint. It is mentioned here: http://eslint.org/docs/user-guide/command-line-interface

[sindresorhus]

This is already supported with the --filename flag. I just forgot to document it. See: https://github.com/sindresorhus/SublimeLinter-contrib-xo/blob/ba4c6fdb6eb129720ebd83356aa3da55a46a1458/linter.py#L16

[sindresorhus]

Made it official as --stdin-filename for clarity and consistency with ESLint.