Added new api-method, and support to change request language

update composer.json

removed ext-bz2 from require

Update README.md

Added new api-methods, translated information about existing api meth…

…od into english

updated composer.json

fix "ext-openssl": "*"

Merge pull request #7 from unisender-dev/obrychuk_master_tlsupdate

TLS 1.2 support, PHP 5.6 required

Merge pull request #6 from ezoterik/patch-2

Обновление PHPDoc для методов

Merge pull request #4 from ezoterik/patch-1

Подавление E_WARNING в file_get_contents

Merge pull request #3 from unisender-dev/master_platform

added new argument platform

Update README.md