Assign RFC #453 it's proper number and link it to the corresponding

issue.

Author: nikomatsakis

README.md

@@ -55,6 +55,7 @@ the direction the language is evolving in.
 * [0439-cmp-ops-reform.md](text/0439-cmp-ops-reform.md)
 * [0446--es6-unicode-escapes.md](text/0446-es6-unicode-escapes.md)
 * [0450-un-feature-gate-some-more-gates.md](text/0450-un-feature-gate-some-more-gates.md)
+* [0453-macro-reform.md](text/0453-macro-reform.md)
 * [0459-disallow-shadowing.md](text/0459-disallow-shadowing.md)
 * [0463-future-proof-literal-suffixes.md](text/0463-future-proof-literal-suffixes.md)
 * [0490-dst-syntax.md](text/0490-dst-syntax.md)

text/0000-macro-reform.md renamed to text/0453-macro-reform.md

@@ -1,6 +1,6 @@
 - Start Date: 2014-11-05
-- RFC PR: (leave this empty)
-- Rust Issue: (leave this empty)
+- RFC PR: [rust-lang/rfcs#453](https://github.com/rust-lang/rfcs/pull/453)
+- Rust Issue: [rust-lang/rust#20008](https://github.com/rust-lang/rust/issues/20008)
 
 # Summary