Updated runtime files. Remove version checks for Vim older than 6.0.

runtime/ftplugin/markdown.vim

@@ -1,7 +1,7 @@
 " Vim filetype plugin
 " Language:		Markdown
 " Maintainer:		Tim Pope <vimNOSPAM@tpope.org>
-" Last Change:		2013 May 30
+" Last Change:		2016 Aug 29
 
 if exists("b:did_ftplugin")
   finish
@@ -11,7 +11,7 @@ runtime! ftplugin/html.vim ftplugin/html_*.vim ftplugin/html/*.vim
 
 setlocal comments=fb:*,fb:-,fb:+,n:> commentstring=>\ %s
 setlocal formatoptions+=tcqln formatoptions-=r formatoptions-=o
-setlocal formatlistpat=^\\s*\\d\\+\\.\\s\\+\\\|^[-*+]\\s\\+
+setlocal formatlistpat=^\\s*\\d\\+\\.\\s\\+\\\|^[-*+]\\s\\+\\\|^\\[^\\ze[^\\]]\\+\\]:
 
 if exists('b:undo_ftplugin')
   let b:undo_ftplugin .= "|setl cms< com< fo< flp<"
@@ -19,4 +19,32 @@ else
   let b:undo_ftplugin = "setl cms< com< fo< flp<"
 endif
 
+function! MarkdownFold()
+  let line = getline(v:lnum)
+
+  " Regular headers
+  let depth = match(line, '\(^#\+\)\@<=\( .*$\)\@=')
+  if depth > 0
+    return ">" . depth
+  endif
+
+  " Setext style headings
+  let nextline = getline(v:lnum + 1)
+  if (line =~ '^.\+$') && (nextline =~ '^=\+$')
+    return ">1"
+  endif
+
+  if (line =~ '^.\+$') && (nextline =~ '^-\+$')
+    return ">2"
+  endif
+
+  return "="
+endfunction
+
+if has("folding") && exists("g:markdown_folding")
+  setlocal foldexpr=MarkdownFold()
+  setlocal foldmethod=expr
+  let b:undo_ftplugin .= " foldexpr< foldmethod<"
+endif
+
 " vim:set sw=2: