Add derive feature to serde

Cargo.toml

@@ -49,7 +49,7 @@ termion = { version = "2.0", optional = true }
 termwiz = { version = "0.20.0", optional = true }
 tui = { version = "0.19", default-features = false, optional = true }
 unicode-width = "0.1.11"
-serde = { version = "1", optional = true }
+serde = { version = "1", optional = true , features = ["derive"] }
 
 [[example]]
 name = "minimal"