Datepoint::createFromFormat declaration issue with PHP 7.1

[Iliyan Ivanov]

Bug Report

Information	Description
Version	4.3.0
PHP version	7.1.25
OS Platform	Ubuntu 16.04.5 LTS

Summary

After upgrade league/period (4.0.1 => 4.3.0) I've got this warning:

Declaration of League\Period\Datepoint::createFromFormat($format, $datetime, ?DateTimeZone $timezone = NULL) should be compatible with DateTimeImmutable::createFromFormat($format, $time, $object = NULL)

Standalone code, or other way to reproduce the problem

Here is a dummy DateTimeImmutable extender class simulating Datepoint class in a playground
https://www.tehplayground.com/nvl4opycmrAOJbIt

[ignace nyamagana butera]

@ilianiv thanks for reporting this issue it has been added to the #73 PR and will be released when the merge is done.

[ignace nyamagana butera]

new release version 4.3.1 with the fix included