Laravel 6 was released and it is a LTS version

* Add Spout in spreadsheet

* REMOVING ```z``` character

Swoole is an event-driven asynchronous & concurrent networking communication framework with high performance written only in C for PHP.

DBUnit is not maintained anymore.
Resolves #1001

In my opinion, it makes sense to remove this recommendation from the list as this package is archived by the owner and is not maintained anymore.

https://github.com/propelorm/Propel2#status-of-the-project

> Our advice:
>
> Use Doctrine if you are looking for a long-term supported, full-featured (and difficult to learn) and stable ORM.
> Use easy to learn Eloquent for prototyping and smaller projects.
> Help us build Propel3, which aims someday to be both of the above.

phpmd is currently orphaned and looking for a new maintainer. While it's
in this unknown-intermediate stage, we should probably point to the repo
anyway because the website is currently down and will probably stay that
way until a new maintainer is found.

phptesting.org returns an HTTP 301 and redirects to this location
anyway.

On 2017 April 17, Oracle acquired Wercker. As a result, the URL has
changed.