Merge pull request #280 from Manishearth/obsolete

RUSTSEC-2020-0011: make obsolete (closes #275)

Author: tarcieri

crates/plutonium/RUSTSEC-2020-0011.toml

@@ -2,6 +2,7 @@
 id = "RUSTSEC-2020-0011"
 package = "plutonium"
 date = "2020-04-23"
+obsolete = true
 informational = "notice"
 title = "Library exclusively intended to obfuscate code."
 url = "https://docs.rs/plutonium/0.2.2/plutonium/"