Add two PETS'16 papers.

Changelog.txt

@@ -1,3 +1,7 @@
+* 2016-05-20
+	- Added paper ``Mailet: Instant Social Networking under Censorship''
+	- Added paper ``CovertCast: Using Live Streaming to Evade Internet Censorship''
+
 * 2016-03-22
 	- Added paper ``SkypeLine: Robust Hidden Data Transmission for VoIP''
 

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">2016-03-22</a> <br />
+      Last updated: <a href="Changelog.txt">2016-05-20</a> <br />
     </div>
   </div>
 </div>

references.bib

@@ -1,3 +1,25 @@
+@article{Li2016a,
+	author = {Shuai Li and Nicholas Hopper},
+	title = {{M}ailet: Instant Social Networking under Censorship},
+	journal = {Privacy Enhancing Technologies},
+	volume = {2016},
+	number = {2},
+	publisher = {De Gruyter Open},
+	year = {2016},
+	url = {http://www.degruyter.com/dg/viewarticle.fullcontentlink:pdfeventlink/$002fj$002fpopets.2015.2016.issue-2$002fpopets-2016-0011$002fpopets-2016-0011.pdf/popets-2016-0011.pdf?t:ac=j$002fpopets.2015.2016.issue-2$002fpopets-2016-0011$002fpopets-2016-0011.xml}
+}
+
+@article{McPherson2016a,
+	author = {Richard McPherson and Amir Houmansadr and Vitaly Shmatikov},
+	title = {{C}overt{C}ast: Using Live Streaming to Evade Internet Censorship},
+	journal = {Privacy Enhancing Technologies},
+	volume = {2016},
+	number = {3},
+	publisher = {De Gruyter Open},
+	year = {2016},
+	url = {http://www.cs.cornell.edu/~shmat/shmat_pets16.pdf},
+}
+
 @inproceedings{Kohls2016a,
 	author = {Katharina Kohls and Thorsten Holz and Dorothea Kolossa and Christina P\"{o}pper},
 	title = {{S}kype{L}ine: Robust Hidden Data Transmission for {V}o{IP}},