Add Laravel 5.7 support

[antonkomarev]

No description provided.

[irazasyed]

The version constraint can just as well be ^5.1.20 (For Laravel).

It will satisfy all Laravel versions matching >=5.1.20 <6.0.0

It's unnecessary to add pipes with tilde version constraints as the second one (~5.2) is anyway going to cover all the way up to <6.0.0. It is best to use caret version range constraint for libraries and have a minimum set as that'll cover all versions.

If you still want to limit the range, you can just as well do something like ^5.1.20 <5.8 (This will cover from 5.1.20 all the way to 5.7.x).

You can test all these here.

[antonkomarev]

Yeah. It's unnecessary, but it just works and I'm not feeling bad with this code because it executes only once on composer update :)
I've thought about replacing all the pipes to ^5.1.20 <5.8 but left it without changes for now because its doesn't affect on anything.
Since Laravel not following SemVer I'm not sure that 5.8+ will have same API, thats why I prefer limiting.
In next version (v4) we definitely should throw old Laravel <5.5 and PHP <7.1.