Added engine=neural to Polly adapter

Added methods to the interface, added language support to the polly a…

…dapter

Return correct response with a field `http_code`.

Updated .CHANGELOG

Updated `dev-master` branch

Updated Changelog

Updated tests

Update package name in composer.json

Merge pull request #6 from KIVagant/features/russian-autocheck

Use Russian voice, if Russian letters found.

1.0.1 1.0.1

1.0.0 1.0.0