[gnome-contacts] Store: add more debug information.

[Niels De Graef <nielsdg src gnome org>]

commit 776d037394c6a7f15763331451867ebc930b5851
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sun Nov 11 19:33:03 2018 +0100

    Store: add more debug information.
    
    So we at least now how many contacts were added/removed.

 src/contacts-store.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/contacts-store.vala b/src/contacts-store.vala
index 3b75a88..961edac 100644
--- a/src/contacts-store.vala
+++ b/src/contacts-store.vala
@@ -176,6 +176,8 @@ public class Contacts.Store : GLib.Object {
     var replaced_individuals = new HashMap<Individual?, Individual?> ();
     var old_individuals = changes.get_keys();
 
+    debug ("Individuals changed: %d old, %d new", old_individuals.size - 1, changes[null].size);
+
     // Pick best replacements at joins
     foreach (var old_individual in old_individuals) {
       if (old_individual == null)