Upgrade to strum 0.22

Author: shepmaster

ui/Cargo.lock

@@ -30,7 +30,7 @@ openssl-probe = "0.1.2"
 dotenv = "0.15.0"
 snafu = "0.6.0"
 prometheus = "0.12.0"
-strum = { version = "0.21.0", features = ["derive"] }
+strum = { version = "0.22.0", features = ["derive"] }
 
 [dependencies.playground-middleware]
 git = "https://github.com/integer32llc/playground-middleware"