Allow customizable commit decorations colors

Signed-off-by: Nazri Ramliy <ayiehere@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/log.c b/builtin/log.c
index 976e16f9..0835866 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -296,6 +296,9 @@
 		default_show_root = git_config_bool(var, value);
 		return 0;
 	}
+	if (!prefixcmp(var, "color.decorate."))
+		return parse_decorate_color_config(var, 15, value);
+
 	return git_diff_ui_config(var, value, cb);
 }