Updates Composer dependencies and made some code improvements while trying to use Larastan (abandoned, wasn't smart enough)

  - Updating doctrine/dbal (v2.9.0 => v2.9.1)
  - Updating opis/closure (3.1.1 => 3.1.2)
  - Updating laravel/framework (v5.7.17 => v5.7.19)
  - Updating nexmo/client (1.5.2 => 1.6.0)
  - Updating barryvdh/reflection-docblock (v2.0.5 => v2.0.6)
  - Updating barryvdh/laravel-ide-helper (v2.5.2 => v2.5.3)
  - Updating phpseclib/phpseclib (2.0.12 => 2.0.13)