[recipes] Update README.md

[Matthias Clasen <matthiasc src gnome org>]

commit 02dc495efcc859e82367a59cc86b308f4630f159
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Dec 29 16:49:14 2016 -0500

    Update README.md
    
    Add a link to the PR for the homebrew formula.

 README.md |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/README.md b/README.md
index a3d1623..54e60d5 100644
--- a/README.md
+++ b/README.md
@@ -79,3 +79,6 @@ cd recipes
 ./autogen --disable-autoar
 make
 ```
+
+This pull request https://github.com/Homebrew/homebrew-core/pull/8303 adds a formula for building
+recipes from a tarball release.