[gtk-doc/gtk-doc-for-gtk4] Bump the version

[Matthias Clasen <matthiasc src gnome org>]

commit 903926b4b6abe0d7ad3ec1ecc3144e42c67015d6
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Apr 13 18:24:47 2020 -0400

    Bump the version
    
    This is just so we can depend on this branch in GTK.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e821e35..24190a0 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gtk-doc', 'c',
-  version: '1.32.1',
+  version: '1.99', # so we can depend on this branch in gtk
   license: 'GPL2+',
   meson_version: '>= 0.50.0', # needed for https://mesonbuild.com/Python-module.html#path
 )