an example of 5.7 compatible package controller (just trial)

controller.php

<?php
namespace Concrete\Package\SocialShareLite;
use Package;
use BlockType;

class Controller extends Package {

	protected $pkgHandle = 'social_share_lite';
	protected $appVersionRequired = '5.6.9';
	protected $pkgVersion = '1.1';
	
	public function getPackageDescription() {
		return t("Add social sharing buttons");
	}
	
	public function getPackageName() {
		return t("Social Share Lite");
	}
	
	public function install() {
		$pkg = parent::install();
		BlockType::installBlockTypeFromPackage('social_share_lite',$pkg);
	}

}