Update to socket2 v0.6 (#35)

Author: Thomasdezeeuw

Cargo.toml

@@ -21,7 +21,7 @@ tokio = { version = "1.6.0", features = ["io-std", "fs", "net", "process"], opti
 # Optionally depend on os_pipe to implement traits for its types.
 os_pipe = { version = "1.2.1", optional = true }
 # Optionally depend on socket2 to implement traits for its types.
-socket2 = { version = "0.5.7", optional = true }
+socket2 = { version = "0.6.0", optional = true }
 # Optionally depend on mio to implement traits for its types.
 mio = { version = "1.0.2", optional = true }