[tracker] Bump version to 2.99.0

[Sam Thursfield <sthursfield src gnome org>]

commit 45118dfe4d85d598405a9ece4132a5f665dc178c
Author: Sam Thursfield <sam afuera me uk>
Date:   Mon Sep 16 00:34:20 2019 +0200

    Bump version to 2.99.0
    
    The 'master' branch is now for work leading towards Tracker 3.0.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index df8764756..6d2ecb0e5 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('tracker', 'c', 'vala',
-        version: '2.3.0',
+        version: '2.99.0',
         meson_version: '>=0.47')
 
 gnome = import('gnome')