[four-in-a-row: 67/72] Fix about dialog credits

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9783ac412496b6f98ebbd046a8cf985179d57d33
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Dec 15 21:41:18 2018 -0600

    Fix about dialog credits
    
    We're missing the > after Jacob's email.
    
    Also, apparently Vala does not NULL-terminate the string arrays, so we
    have to do that manually. Not sure if this should be surprising or just
    expected.

 src/four-in-a-row.vala | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/four-in-a-row.vala b/src/four-in-a-row.vala
index 47a6058..4016710 100644
--- a/src/four-in-a-row.vala
+++ b/src/four-in-a-row.vala
@@ -637,15 +637,17 @@ class FourInARow : Gtk.Application {
         const string authors[] = {"Tim Musson <trmusson ihug co nz>",
             "David Neary <bolsh gimp org>",
             "Nikhar Agrawal <nikharagrawal2006 gmail com>",
-            "Jacob Humphrey <jacob ryan humphrey gmail com"
+            "Jacob Humphrey <jacob ryan humphrey gmail com>",
+            null
         };
 
         const string artists[] = { "Alan Horkan",
             "Anatol Drlicek",
-            "Based on the Faenza icon theme by Matthieu James"
+            "Based on the Faenza icon theme by Matthieu James",
+            null
         };
 
-        const string documenters[] = {"Timothy Musson"};
+        const string documenters[] = {"Timothy Musson", null};
 
         Gtk.show_about_dialog(window,
             name: _(Config.APPNAME_LONG),