Update dependency version of fkubis/teamspeak-php-framework

[element-code]

The locked Version of fkubis/teamspeak-php-framework is not the latest commit.
This leads to a Pharse error on PHP 7.x (unset($this)).

Would be better anyway to exclude /vendor from git and do a composer install instead of a composer dump-autoload -o on installation.

[JABirchall]

This is a remanent of the timeout issue #1 which was pending to be merged into fkubis repo for months.
I included the vendor directory with changes.
Feel free to put up a PR if you'd like. I see fkubis already has the unset fixed on his repo.