Remove Taking PHP Seriously video [skip ci]

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README.md

 
 * [PHP UK Conference](https://www.youtube.com/user/phpukconference/videos) - A collection of videos from the PHP UK Conference.
 * [Programming with Anthony](https://www.youtube.com/playlist?list=PLM-218uGSX3DQ3KsB5NJnuOqPqc5CW2kW) - A video series by Anthony Ferrara.
-* [Taking PHP Seriously](https://www.infoq.com/presentations/php-history/) - A talk outlining PHP's strengths by Keith Adams of Facebook.
 * [Laracasts](https://laracasts.com) - Screencasts about Laravel, Vue JS and more.
 * [Laravel YouTube Channel](https://www.youtube.com/channel/UCfO2GiQwb-cwJTb1CuRSkwg) - The official Laravel YouTube channel.
 * [SymfonyCasts](https://symfonycasts.com/) - Screencasts and tutorials about PHP and Symfony.