update the title as well

README.md

@@ -1,4 +1,4 @@
-# `rustc-builtins`
+# `compiler-builtins`
 
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 [![Build Status](https://travis-ci.org/rust-lang-nursery/compiler-builtins.svg?branch=master)](https://travis-ci.org/rust-lang-nursery/compiler-builtins)