Empty lines mess up code snippet

[Nixinova]

This is what metrics generates:

while this is what the actual diff is: Nixinova/LinguistJS@22e379f

There's an erroneous space before +## Next and the line ## 2.4.1 should not be highlighted: they've merged into the preceeding empty lines

[lowlighter]

Should have been fixed by 60857e1