[geary] Add missing source file to POTFILES.

[Michael Gratton <mjog src gnome org>]

commit c3a09eb6436d31783f4214db89d0026134129d02
Author: Michael James Gratton <mike vee net>
Date:   Tue Oct 4 10:51:00 2016 +1100

    Add missing source file to POTFILES.

 po/POTFILES.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index c69530c..eeec6f6 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -3,6 +3,7 @@ desktop/geary.appdata.xml.in
 desktop/geary.desktop.in
 desktop/geary-autostart.desktop.in
 [type: gettext/ini]desktop/geary-attach.contract.in
+src/geary-version.vala.in
 src/client/accounts/account-dialog-account-list-pane.vala
 src/client/accounts/account-dialog-add-edit-pane.vala
 src/client/accounts/account-dialog-edit-alternate-emails-pane.vala