New horizontal rule regex breaks backwards compatibility (and GFM compliance)

[tivie]

The new regex breaks backwards compatibility in the following cases:

• ---: not parsed as horizontal rule
• - - -: not parsed as horizontal rule

[schoettler]

Still not parsed as horizontal rule (?) (from Markdown to HTML)

[tivie]

@schoettler It's working fine. Was fixed in 113f5f6

[schoettler]

Whoops, needs a line break, my apologies

--- *works

text --- *does not work

As per Markdown spec

[tivie]

no prob