Work around russross/blackfriday bug

go.mod

@@ -39,3 +39,5 @@ require (
 )
 
 replace github.com/dutchcoders/transfer.sh-web => gitea.arpa.li/ArchiveTeam/transfer.sh-web v0.0.0-20210210050940-b1786a55e170
+// https://github.com/russross/blackfriday/issues/500
+replace github.com/russross/blackfriday/v2 => gopkg.in/russross/blackfriday.v2 v2.0.1