Ignore binary files

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Copy the flags from ripgrep: https://github.com/BurntSushi/ripgrep/blob/master/src/app.rs#L745

Exposed as https://github.com/BurntSushi/ripgrep/blob/master/src/args.rs#L902

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Codespell ignores files with a null character in the first 1024 bytes
https://github.com/codespell-project/codespell/blob/master/codespell_lib/_codespell.py#L351

scspell-go first checks some know extensions
https://github.com/client9/misspell/blob/master/mime.go#L61
Otherwise, it checks for know magic numbers and falls back to mime detction
https://github.com/client9/misspell/blob/master/mime.go#L124

Both cases are unconditional.

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Looks like ripgrep uses null byte detection

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Probably going to implement this in a fast turn around way and then open an issue to speed it up.