This update for tryton to version 4.2.19 fixes the following issues:

Security issue fixed:

- CVE-2018-19443: Fixed an information leakage by attemping to initiate an
unencrypted connection, which would fail eventually, but might leak session
information of the user (boo#1117105)

This update also contains newer versions of tryton related packages with general bug fixes and updates:

- trytond 4.2.17
- trytond_account 4.2.10
- trytond_account_invoice 4.2.7
- trytond_purchase_request 4.2.4
- trytond_stock 4.2.8
- trytond_stock_supply 4.2.3