Fix missing publisher

Author: kasnder

paper.bib

@@ -270,7 +270,7 @@ @inproceedings {kollnig2021_consent
       isbn = {978-1-939133-25-0},
       pages = {181--196},
       url = {https://www.usenix.org/conference/soups2021/presentation/kollnig},
-      publisher = ,
+      publisher = {{USENIX Association}},
       month = aug,
 }
 
@@ -282,4 +282,4 @@ @inbook{appchk
   title = {The AppChk Crowd-Sourcing Platform: Which Third Parties are iOS Apps Talking To?},
   isbn = {978-3-030-78119-4},
   doi = {10.1007/978-3-030-78120-0_15}
-}
+}