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.

* Add Learning Linux

* Add Voices of the ElePHant

* Rename video category to cover podcasts

* Add PHP Roundtable

* Cleanup description

* Add PHP Annotated Monthly

* Fix title typo

* Fix