composer 在thinkphp5下安装easywechat 报错
Failed to enable crypto
failed to open stream: operation failed
解决方法，更改 Packagist 为国内镜像，不知道会不会对后续操作有影响，反正现在是可以了：
composer config -g repo.packagist composer https://packagist.phpcomposer.com
然后再安装
composer require overtrue/wechat:~4.0 -vvv