protected function fillRepoToken()
    {
        if ($this->config->hasRepoToken()) {
            $this->env['COVERALLS_REPO_TOKEN'] = $this->config->getRepoToken();
        }

        // backup
        if (isset($this->env['COVERALLS_REPO_TOKEN'])) {
            $this->readEnv['COVERALLS_REPO_TOKEN'] = $this->env['COVERALLS_REPO_TOKEN'];
        }

        return $this;
    }