Add tracking issue

Author: joshtriplett

library/core/src/net/mod.rs

@@ -9,7 +9,7 @@
 //! * [`SocketAddr`] represents socket addresses of either IPv4 or IPv6; [`SocketAddrV4`]
 //!   and [`SocketAddrV6`] are respectively IPv4 and IPv6 socket addresses
 
-#![unstable(feature = "ip_in_core", issue = "none")]
+#![unstable(feature = "ip_in_core", issue = "108443")]
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr, Ipv6MulticastScope};