New Features:

• Variable markdown-follow-link-functions extends
  markdown-follow-link-at-point similarly to Org's
  org-open-at-point-functions, allowing other libraries to
  handle links specially. GH-780
• Support media handler for images and drag and drop images GH-804
• Add functions to move to the beginning and end of lines
  (markdown-beginning-of-line and markdown-end-of-line), and the
  variable markdown-special-ctrl-a/e, like Org mode.
• Trailing whitespace characters for line breaks are hidden when using
  markdown-hide-markup
• fill-paragraph considers GFM alert syntax GH-838
• Add new flag markdown-wiki-link-retain-case GH-839

Bug fixes:

• Don't highlight superscript/subscript in math inline/block GH-802
• Fix table alignment when a column has a seperator in code block GH-817
• Fix the regexp in the download languages script GH-827
• Don't hide backslashes in code blocks when using markdown-hide-markup
  and markdown-fontify-code-blocks-natively together [GH-766][]
• Fix markdown-fontify-whole-heading-line regression GH-848
• Fix using fundamental-mode issue when editting code block GH-868
• Fix highlighting URL in angle brackesGH-822

Improvements:

• Apply url-unescape against URL in an inline link GH-805
• Show mode toggle message only if it is called interactively
• Copy markdown-css-paths in the output buffer GH-834
• Change temporary buffer name according to the Emacs naming convention GH-848
• Mark markdown-css-paths safe as file local variables GH-834
• Resolve style sheets in markdown-css-paths relative to the Markdown file
  (if the path starts with ./ or ../) GH-855 GH-870
• Don't insert list item in code block GH-841
• Don't set mouse face if markdown-mouse-follow-link is nil GH-879