Update smoltcp version

Author: Martijn Groeneveldt

Cargo.toml

@@ -26,7 +26,7 @@ cortex-m = "0.6.2"
 log = { version = "0.4", optional = true }
 
 [dependencies.smoltcp]
-version = "0.6.0"
+version = "0.7.0"
 default-features = false
 features = ["ethernet", "proto-ipv4"]
 optional = true