Requiring Forked Version In Composer

Question

I have read this in countless other places, but for some reason, this doesn't appear to be working for me. It never pulls the version from the forked repo? Here is what I am trying to pull: https://github.com/Jafo232/laravel-medialibrary/tree/v3

Here is my composer file:

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/Jafo232/laravel-medialibrary"
        }
    ],
    "require": {
        "php": ">=5.6.4",
        "barryvdh/laravel-debugbar": "^2.2",
        "ixudra/curl": "^6.10",
        "jenssegers/model": "^1.1",
        "laracasts/flash": "^2.0",
        "laravel/framework": "5.4.*",
        "laravel/tinker": "~1.0",
        "spatie/laravel-medialibrary": "v3"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "laravelcollective/html": "~5.0",
        "phpunit/phpunit": "~5.7"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {

        "sort-packages": true
    }
}