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.

As browsers continue to push https-first, more sites are redirecting
http visits to https. In some cases, they return an HTTP 301 response
which the test suite registers as a broken link.

Removing a non-working hginit.com link.

The Security Advistories Checker website will shut down at the end of October.

Brew PHP Switcher is the most currently maintained tool for switching between versions of php.

* Fix tests

* Fix more redirects

* Fix appserver.io link

Remove podcast Voices of the ElePHPant duplicate entry.