[aisleriot] build: Allow to explicitly select guile 3.0

[Christian Persch <chpe src gnome org>]

commit 809656b795d703cc17dcd52816893191067c4731
Author: Christian Persch <chpe src gnome org>
Date:   Fri Mar 27 20:53:06 2020 +0100

    build: Allow to explicitly select guile 3.0

 meson_options.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 9dc4d283..b16c5fe0 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -66,7 +66,7 @@ option(
 option(
   'guile',
   type: 'combo',
-  choices: ['2.2', '2.0', 'auto',],
+  choices: ['3.0', '2.2', '2.0', 'auto',],
   value: 'auto',
   description: 'Which guile version to use',
 )