flarum composer.json for php 7.2

composer.json

{
    "name": "flarum/flarum",
    "description": "Delightfully simple forum software.",
    "type": "project",
    "keywords": ["forum", "discussion"],
    "homepage": "http://flarum.org",
    "license": "MIT",
    "authors": [
        {
            "name": "Toby Zerner",
            "email": "[email protected]"
        },
        {
            "name": "Franz Liedke",
            "email": "[email protected]"
        }
    ],
    "support": {
        "issues": "https://github.com/flarum/core/issues",
        "source": "https://github.com/flarum/flarum",
        "docs": "http://flarum.org/docs"
    },
    "require": {
        "flarum/core": "dev-master",
        "flarum/flarum-ext-approval": "dev-master",
        "flarum/flarum-ext-auth-facebook": "dev-master",
        "flarum/flarum-ext-auth-github": "dev-master",
        "flarum/flarum-ext-auth-twitter": "dev-master",
        "flarum/flarum-ext-bbcode": "dev-master",
        "flarum/flarum-ext-emoji": "dev-master",
        "flarum/flarum-ext-english": "dev-master",
        "flarum/flarum-ext-flags": "dev-master",
        "flarum/flarum-ext-likes": "dev-master",
        "flarum/flarum-ext-lock": "dev-master",
        "flarum/flarum-ext-markdown": "dev-master",
        "flarum/flarum-ext-mentions": "dev-master",
        "flarum/flarum-ext-pusher": "dev-master",
        "flarum/flarum-ext-statistics": "dev-master",
        "flarum/flarum-ext-sticky": "dev-master",
        "flarum/flarum-ext-subscriptions": "dev-master",
        "flarum/flarum-ext-suspend": "dev-master",
        "flarum/flarum-ext-tags": "dev-master",
        "s9e/flarum-ext-autoimage": "dev-master",
        "s9e/flarum-ext-mediaembed": "dev-master",
        "sijad/flarum-ext-links": "dev-master"
    },
    "config": {
        "preferred-install": "dev",
        "sort-packages": true
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}