Fix URL for Jones2011a.

https://www.cs.princeton.edu/~najones/publications/cor-foci11.pdf now
returns a 404 page that says "The person that owns this web page has
moved it to the following URL: https://www.nicholasajones.com".
www.nicholasajones.com is NXDOMAIN for me.
I found another copy on Michael Freedman's web space.

Signed-off-by: Philipp Winter <phw@nymity.ch>

Changelog.txt

@@ -1,3 +1,6 @@
+* 2017-12-14
+	- Updated paper ``Hiding Amongst the Clouds: A Proposal for Cloud-based Onion Routing''
+
 * 2017-12-01
 	- Added paper ``Self-Censorship on Facebook''
 

header.tpl

@@ -83,7 +83,7 @@
       (<a href="author_reverse.html">reverse</a>) <a href="author.html">author</a> <br />
       Feedback: <a href="mailto:phw@nymity.ch">phw@nymity.ch</a> (<a
       href="https://nymity.ch/openpgp_public_key.txt">OpenPGP</a>) <br />
-      Last updated: <a href="Changelog.txt">2017-12-01</a> <br />
+      Last updated: <a href="Changelog.txt">2017-12-14</a> <br />
       Onion site: <a href="http://3wcwjjnuvjyazeza.onion">3wcwjjnuvjyazeza.onion</a> <br />
       Code: <a href="https://github.com/NullHypothesis/censorbib">GitHub</a>
     </div>

references.bib

@@ -573,7 +573,7 @@
 	booktitle = {Free and Open Communications on the Internet},
 	publisher = {USENIX},
 	year = {2011},
-	url = {http://www.cs.princeton.edu/~najones/publications/cor-foci11.pdf},
+	url = {https://www.cs.princeton.edu/~mfreed/docs/cor-foci11.pdf},
 }
 
 @inproceedings{Jones2015a,