documentation update

minor documentation improvements

update xml schema

Allow Laravel 6.x

Merge pull request zerospam#40 from smares/patch-1

Better check the arguments passed to _i, _n and _s

Merge pull request zerospam#39 from daveatpeta/master

Add compatibility for Laravel 6.0

update composer.json

use filemtime and filesize

Faster to check for file change.

Bump readme for laravel 5.6

Keep version for laravel 5.5