Add new PHP websites and podcasts (#670)

* 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

README.md

 * [PHPTrends](https://phptrends.com/) - An overview of fastest growing PHP libraries.
 * [Securing PHP](http://securingphp.com/) - A newsletter about PHP security and library recommendations.
 * [Seven PHP](https://7php.com/) - A website that interviews members of the PHP community.
+* [PHP Annotated Monthly](https://blog.jetbrains.com/phpstorm/category/php-annotated-monthly/) - A monthly digest of PHP news.
 
 ## Other Websites
 *Useful websites related to web development.*
 
 * [Atlassian Git Tutorials](https://www.atlassian.com/git) - A series of Git tutorials.
 * [Hg Init](http://hginit.com/) - A series of Mercurial tutorials.
+* [Learning Linux](https://linuxjourney.com/) - A website for learning Linux.
 * [Semantic Versioning](https://semver.org/) - A website explaining semantic versioning.
 * [Servers for Hackers](https://serversforhackers.com/) - A newsletter about server management.
 * [The Open Web Application Security Project (OWASP)](https://www.owasp.org/index.php/Main_Page) - An open software security community.
 * [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.
+* [Voices of the ElePHPant](https://voicesoftheelephpant.com/) - Interviews with members of PHP community.
 
 ## PHP Podcasts
-*Podcasts with a main focus on PHP topics*
+*Podcasts with a focus on PHP topics.*
 
 * [PHP Town Hall](https://phptownhall.com/) - A casual PHP podcast by Ben Edmunds and Phil Sturgeon.
 * [Voices of the ElePHPant](https://voicesoftheelephpant.com/) Interviews with the people that make the PHP community special.