Log Message:
devel/go-blackfriday: Update to 1.5.1

Changes since 1.4.0:

    Added HTML_SMARTYPANTS_QUOTES_NBSP, which allows having nonbreakable spaces
    inside « French guillemets » (Issue #378)
    Added EXTENSION_JOIN_LINES, which joins newline-separated lines into a
    single paragraph. Useful for Chinese text.
    Implemented support for CDATA section (Issue #165)
    Fixed links with parentheses (Issue #116)
    Fixed fenced code blocks inside lists (Issue #228)
    Fixed regression, panic in reference links (Issues #172 and #173)
    Fixed adjacent list merging (Issue #235)
    Fixed definition lists that contain other lists (Issue #263)
    Fixed fenced code pre-processing (Issue #279)
    Fixed panic with recursive footnotes (Issue #241)
    Removed rel="footnote", which is no longer valid.