Merge pull request #2709 from alex/coda-goes-https

As always, recommend cryptoing while you crypto
diff --git a/docs/hazmat/primitives/constant-time.rst b/docs/hazmat/primitives/constant-time.rst
index 1394b6b..1c1d544 100644
--- a/docs/hazmat/primitives/constant-time.rst
+++ b/docs/hazmat/primitives/constant-time.rst
@@ -40,4 +40,4 @@
                        ``bytes``.
 
 
-.. _`Coda Hale's blog post`: http://codahale.com/a-lesson-in-timing-attacks/
+.. _`Coda Hale's blog post`: https://codahale.com/a-lesson-in-timing-attacks/