Log Message:
Update to 0.7.7
Update DEPENDS

Upstream changes:
CHANGES IN markdown VERSION 0.7.7

BUG FIXES

  o renderMarkdown() works now even if text = character(0) or ""

  o added an `encoding` argument to renderMarkdown() since multi-byte characters
  in renderMarkdown() did not work on Windows (thanks, Kohske Takahashi, #63)

  o fixed #64: invalid 'n' argument in rpubsUpload() (thanks, Wouter van
  Atteveldt)

MAJOR CHANGES

  o if renderMarkdown() returns a character vector, it will be marked with the
  UTF-8 encoding if it contains multi-byte characters