adding support php8 (#18)

Co-authored-by: Dmitriy Fedosov <dfedosov@belkacar.ru>

Add group related notification ID (#16)

Co-authored-by: Daniil Glushchenko <dgluschenko@belkacar.org>

Add group related notification ID (#15)

Co-authored-by: Daniil Glushchenko <dgluschenko@belkacar.org>

Remove redundant stuff

Add huawei platform (#11)

* Add huawei platform

Update composer.json

Prepare version 1.9.0.

Minor updates.

Add response value to Pushwoosh Exceptions when a curl request execution

fails

Update Eclipse buildpath.