Fix amix#453

Author: amix

update_plugins.py

@@ -32,7 +32,7 @@
 vim-colors-solarized https://github.com/altercation/vim-colors-solarized
 vim-indent-object https://github.com/michaeljsmith/vim-indent-object
 vim-less https://github.com/groenewege/vim-less
-vim-markdown https://github.com/tpope/vim-markdown
+vim-markdown https://github.com/plasticboy/vim-markdown
 vim-pyte https://github.com/therubymug/vim-pyte
 vim-snipmate https://github.com/garbas/vim-snipmate
 vim-snippets https://github.com/honza/vim-snippets