Bumped nix to 0.27.1.

Author: heksesang

Cargo.toml

@@ -41,7 +41,7 @@ tokio = { version = "1.5.0", features = [
 ] }
 
 [target.'cfg(unix)'.dependencies]
-nix = "0.26"
+nix = { version = "0.27.1", features = ["signal"] }
 psutil = { version = "3.2.0", default-features = false, features = ["process"] }
 rusty_vainfo = { version = "0.1.4", optional = true }