[recipes] Update README.md a bit

[Matthias Clasen <matthiasc src gnome org>]

commit ad4cd159d677153e59332d6d3a2fdcf9f9eb42f1
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 28 13:05:16 2017 +0200

    Update README.md a bit
    
    It was still mentioning autogen.sh in one place.

 README.md |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index fa4708a..0040ed5 100644
--- a/README.md
+++ b/README.md
@@ -66,8 +66,8 @@ git clone git://git.gnome.org/recipes
 - Build from git as usual, disabling some problematic dependencies:
 ```
 cd recipes
-./autogen --disable-autoar --disable-canberra
-make
+meson -Dautoar=no -Dcanberra=no build
+ninja -C build
 ```
 To build a released version of recipes on OS X, just