Add two more PETS'20 papers.

header.tpl

@@ -179,7 +179,8 @@
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-        <a href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2020-05-13</a>
+        <a
+        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2020-07-13</a>
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references.bib

@@ -1,3 +1,27 @@
+@article{Sharma2020a,
+	author = {Piyush Kumar Sharma and Devashish Gosain and Himanshu Sagar and Chaitanya Kumar and Aneesh Dogra and Vinayak Naik and H. B. Acharya and Sambuddho Chakravarty},
+	title = {{SiegeBreaker}: An {SDN} Based Practical Decoy Routing System},
+	journal = {Privacy Enhancing Technologies},
+	volume = {2020},
+	number = {3},
+	publisher = {Sciendo},
+	year = {2020},
+	pages = {243--263},
+	url = {https://petsymposium.org/2020/files/papers/issue3/popets-2020-0051.pdf},
+}
+
+@article{VanderSloot2020a,
+	author = {Benjamin VanderSloot and Sergey Frolov and Jack Wampler and Sze Chuen Tan and Irv Simpson and Michalis Kallitsis and J. Alex Halderman and Nikita Borisov and Eric Wustrow},
+	title = {Running Refraction Networking for Real},
+	journal = {Privacy Enhancing Technologies},
+	volume = {2020},
+	number = {3},
+	publisher = {Sciendo},
+	year = {2020},
+	pages = {321--335},
+	url = {https://petsymposium.org/2020/files/papers/issue4/popets-2020-0073.pdf},
+}
+
 @article{Minaei2020a,
 	author = {Mohsen Minaei and Pedro Moreno-Sanchez and Aniket Kate},
 	title = {{MoneyMorph}: Censorship Resistant Rendezvous using Permissionless Cryptocurrencies},