Add three Usenix Security'22 papers.

https://www.usenix.org/conference/usenixsecurity22/technical-sessions

header.tpl

@@ -181,7 +181,7 @@
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-        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2022-07-15</a>
+        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2022-08-11</a>
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references.bib

@@ -1,3 +1,30 @@
+@inproceedings{Bhaskar2022a,
+	author = {Abhishek Bhaskar and Paul Pearce},
+	title = {Many Roads Lead To {Rome}: How Packet Headers Influence {DNS} Censorship Measurement},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2022},
+	url = {https://www.usenix.org/system/files/sec22-bhaskar.pdf},
+}
+
+@inproceedings{Harrity2022a,
+	author = {Michael Harrity and Kevin Bock and Frederick Sell and Dave Levin},
+	title = {{GET} /out: Automated Discovery of Application-Layer Censorship Evasion Strategies},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2022},
+	url = {https://www.usenix.org/system/files/sec22-harrity.pdf},
+}
+
+@inproceedings{Xue2022a,
+	author = {Diwen Xue and Reethika Ramesh and Arham Jain and Michalis Kallitsis and J. Alex Halderman and Jedidiah R. Crandall and Roya Ensafi},
+	title = {{OpenVPN} is Open to {VPN} Fingerprinting},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2022},
+	url = {https://www.usenix.org/system/files/sec22-xue-diwen.pdf},
+}
+
 @inproceedings{Figueira2022a,
 	author = {Gabriel Figueira and Diogo Barradas and Nuno Santos},
 	title = {{Stegozoa}: Enhancing {WebRTC} Covert Channels with Video Steganography for Internet Censorship Circumvention},