Consecutive lines don't condense their whitespace

[d0c-s4vage]

Describe the bug In most markdown renderers, consecutive lines of text end up having their whitespace condensed to a single space.

E.g.

Markdown:

This is markdown text again
This is markdown text again
This is markdown text again

Rendered by GitHub (which I think is the wrong way - softbreaks should be spaces, not newlines):

Rendered b;y GitLab

Additional context

See this stackoverflow post: https://stackoverflow.com/questions/41513565/markdown-and-line-wrapping

[d0c-s4vage]

Fixed with #179