v1.12.13-p3: Merge pull request #3 from mifreudenthaler/master

Optionally use tlsv1.2

v1.12.13-p2: Some PHP 7.2 fixes

Merge pull request #2 from koala-framework/fix-declaration

fixed declaration of assemble function (php 7.2), added missing argument

v1.12.13-p1: Fix '0' as valid domainPart

Fixes domains like example.192.168.0.233.xip.io (note the 0)

`empty('0')` is true, wtf