fix failure to parse arrays with newline before comma

[jakecoffman]

An array with newlines such as this fails to parse:

array = [1
,2]

According to the TOML spec, whitespace in arrays is ignored. I verified this behavior with a few TOML validators as well.

I've never done any Citrus before so feel free to fix any blunders, thanks!

[emancu]

Thanks @jakecoffman for your contribution!

I'm still a bit unsure about your changes, they look ok but I think TOML specifies trailing comma only, nothing about leading comma.
https://toml.io/en/v1.0.0#array

The idea of failing to parse is to have an only way to do it, so the styling doesn't diverge

[jakecoffman]

The spec at that URL says

Any number of newlines and comments may precede values, commas, and the closing bracket.

And the official ABNF linked at the bottom has:

array-values =  ws-comment-newline val ws-comment-newline array-sep array-values
array-values =/ ws-comment-newline val ws-comment-newline [ array-sep ]

array-sep = %x2C  ; , Comma

ws-comment-newline = *( wschar / [ comment ] newline )

So since ws-comment-newline can be between val and array-sep, that makes this valid TOML.

[emancu]

@jakecoffman Your changes were released in v2.2.0!