Update CHANGELOG.md

Add missing IPv4/IPv6 validation messages

I don't like the fact we have to add 
```
<script>
        window.Laravel = {!! json_encode([
            'csrfToken' => csrf_token(),
        ]) !!};
</script>
```
To have it working, when the docs suggest adding only the meta tag. This will get the token from the meta tag.

Added port to sqlsrv settings

Most installations won't work without it.

Add sqlsrv as group connection

Since the doc says that the Laravel supports SQL Server out of the box, makes sense add it, out of the box.

Revert Queue Prefix

fix typo

Update readme.md

doctype uppercase to lowercase

no harm, only benefits

Allow filesystem to be changed on config

Allow to change the filesystem storage on the fly.
For example, you can swap the storage disk with a fake one with
Storage::fake for tests.

this PR goes along with https://github.com/laravel/framework/pull/18860

Updated changelog

Ignore the npm debug log

When an NPM run fails, is created a npm-debug.log file. This file can be ignored and should not be published on a Git based repository.

More clear way to assign middleware in controller

Assign guest middleware to LoginController using documented way https://laravel.com/docs/5.4/controllers#controller-middleware 
to avoid confusing with $options array values meaning.