Fix link to orgmode.org (#52)

[skip ci]

README.org

@@ -12,7 +12,7 @@
 #+BEGIN_QUOTE
 "Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system."
 
-- [[orgmode.org]]
+- [[http://orgmode.org/][orgmode.org]]
 #+END_QUOTE
 
 The purpose of this package is to come as close as possible as parsing an =*.org= document into HTML, the same way one might publish [[http://orgmode.org/worg/org-tutorials/org-publish-html-tutorial.html][with org-publish-html from Emacs]].