[recipes] Fix a typo

[Matthias Clasen <matthiasc src gnome org>]

commit c44d794b910aa24eea6eb9f7bd0fb02475f87fba
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 10 22:25:52 2017 -0400

    Fix a typo

 README.md |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/README.md b/README.md
index 651d527..0d0a7f2 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ brew install automake
 brew install libtool
 brew install gettext
 brew install pkg-config
-brew install mason
+brew install meson
 ```
 - MacOS Sierra and Gettext
 On Sierra (at the least) gettext formula is keg only, in order to let the configuration script