[tracker-miners] build: Require Meson >= 0.50

[Sam Thursfield <sthursfield src gnome org>]

commit 60145dddc28bef04c33963690fbec6ac090f38a6
Author: Sam Thursfield <sam afuera me uk>
Date:   Wed May 1 12:35:36 2019 +0200

    build: Require Meson >= 0.50
    
    Meson helpfully warns us that this is needed:
    
        WARNING: Project specifies a minimum meson_version '>=0.47' but uses features which were added in 
newer versions:
         * 0.50.0: {'install arg in configure_file'}

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index ac3cfd96c..67346e1d4 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('tracker-miners', 'c',
         version: '2.2.1',
-        meson_version: '>=0.47')
+        meson_version: '>=0.50')
 
 gnome = import('gnome')
 i18n = import('i18n')