[chronojump] Updated howto compile on mac

[Xavier de Blas <xaviblas src gnome org>]

commit fdb81f3afce01e69d3722152d38478b6bca96f24
Author: Xavier de Blas <xaviblas gmail com>
Date:   Fri Jun 19 15:03:05 2020 +0200

    Updated howto compile on mac

 howto_compile.txt | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/howto_compile.txt b/howto_compile.txt
index ac036e00..92210737 100644
--- a/howto_compile.txt
+++ b/howto_compile.txt
@@ -24,6 +24,7 @@ brew install autoconf intltool automake gettext libtool glib pkg-config
 
 git clone https://gitlab.gnome.org/GNOME/chronojump.git
 git pull
+cd package/macos
 make