Add RFC PR link

Author: dmarcuse

text/0000-cargo-artifact-specific-dependencies.md

@@ -1,6 +1,6 @@
 - Feature Name: `cargo_artifact_specific_dependencies`
 - Start Date: 2019-03-24
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/2887)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary