Merge branch 'master' into forapi

# Conflicts:
#	Cargo.lock
#	libs/hbb_common/protos/rendezvous.proto
#	libs/hbb_common/src/tcp.rs
#	libs/hbb_common~master

src/main.rs

@@ -32,6 +32,7 @@ fn main() -> ResultType<()> {
     }
     let rmem = get_arg("rmem").parse::<usize>().unwrap_or(RMEM);
     let serial: i32 = get_arg("serial").parse().unwrap_or(0);
+    crate::common::check_software_update();
     RendezvousServer::start(port, serial, &get_arg_or("key", "-".to_owned()), rmem)?;
     Ok(())
 }