Added 4.3.4 release notes
Added 4.3.4 release notes

Martin1982/OpenConext-engineblock,rjkip/OpenConext-engineblock,thijskh/OpenConext-engineblock,rjkip/OpenConext-engineblock,Martin1982/OpenConext-engineblock,Martin1982/OpenConext-engineblock,Martin1982/OpenConext-engineblock,rjkip/OpenConext-engineblock,thijskh/OpenConext-engineblock,rjkip/OpenConext-engineblock,thijskh/OpenConext-engineblock,thijskh/OpenConext-engineblock