[PATCH docs] Fix link to original markdown specification 5 years ago

From Matthias Totschnig to ~sircmpwn/sr.ht-dev

---
 markdown/index.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/markdown/index.md b/markdown/index.md
index 26bc589..59c243d 100644
--- a/markdown/index.md
+++ b/markdown/index.md
@@ -1,7 +1,7 @@
 Across the site, sr.ht uses a consistent Markdown syntax based on Python's
 [Markdown](https://pypi.python.org/pypi/Markdown) package, which implements John
 Gruber's [original Markdown
-specification](https://pypi.python.org/pypi/Markdown).
+specification](https://daringfireball.net/projects/markdown/).
[message trimmed]