Fix autoescaping for Twig 2.x

[andriokha]

Thanks for a very useful project!

Currently there's a boolean configuration option called autoescape that gets passed directly to \Twig\Environment::__construct() in

twig-renderer/src/TwigRenderer.php

Lines 50 to 52 in 4b09a3f

	$twig = new \Twig_Environment($loaders, [
	'debug' => $this->config['debug'],
	'autoescape' => $this->config['autoescape'],

In Twig 1:

• true is the same as html and uses that escaping strategy
• false disables auto-escaping

In Twig 2 true was removed as an option (so to get the old true behaviour you should pass html).

It occurred to me that we could expose the full range of options, but I'm not sure if there's really any demand for that.