Upgraded to Laravel 5.7

[GrahamCampbell]

Current state of dependencies:

Grahams-MacBook-Pro-2:Cachet graham$ composer outdated -vv
bacon/bacon-qr-code            1.0.3   2.0.0  BaconQrCode is a QR code generator for PHP.
doctrine/dbal                  v2.8.1  v2.9.1 Database Abstraction Layer
php-http/guzzle6-adapter       v1.1.1  v2.0.1 Guzzle 6 HTTP Adapter
php-http/httplug               v1.1.0  v2.0.0 HTTPlug, the HTTP client abstraction for PHP
phpdocumentor/type-resolver    0.4.0   0.7.1 
pragmarx/google2fa             v0.7.1  v4.0.0 A One Time Password Authentication package, compatible with Google Authenticator.
ralouphie/getallheaders        2.0.5   3.0.2  A polyfill for getallheaders.
simplesoftwareio/simple-qrcode 1.3.3   2.0.0  Simple QrCode is a QR code generator made for Laravel.
twig/twig                      v1.36.0 v2.6.0 Twig, the flexible, fast, and secure template language for PHP
zendframework/zend-diactoros   1.8.6   2.1.0  PSR HTTP Message implementations