Cargo: fix docs.rs build (hopefully)

If you enable the socket feature, you must enable at least one of the following features: socket-raw, socket-udp, socket-tcp, socket-icmp, socket-dhcp

Signed-off-by: Moritz Scheuren <moritz.scheuren@systec-electronic.com>

Author: systec-ms

Cargo.toml

@@ -15,7 +15,7 @@ travis-ci = { repository = "astro/stm32-eth", branch = "master" }
 maintenance = { status = "experimental" }
 
 [package.metadata.docs.rs]
-features = [ "smi", "smoltcp-phy", "stm32f429" ]
+features = [ "smi", "smoltcp-phy", "stm32f429", "smoltcp/socket-tcp" ]
 
 [dependencies]
 volatile-register = "0.2"