Table with a space after a header separator row

[vaind]

Hopefully, this should be an easy fix: if there's a space after the table row separating headers from content, the table is not rendered properly (e.g. on https://dart-lang.github.io/markdown/). Spaces at the end of any other line don't break the table. I've noticed this when publishing a package to pub.dev - GitHub rendered the table properly.

this works:

| header    | header 2  |
| --------- | --------: |
| row       |       val |
| row       |       val |

this doesn't (notice the space at the end of the second line)

| header    | header 2  |
| --------- | --------: | 
| row       |       val |
| row       |       val |