Merge pull request codeguy#897 from kenguest/gh-pages

Add link for smknstd/modern-php-cheatsheet in the Other Resources section

Author: codeguy

_posts/16-08-01-Sites.md

@@ -8,8 +8,8 @@ title:   Other Useful Resources
 
 ### Cheatsheets
 
-* [PHP Cheatsheets](http://phpcheatsheets.com/) - for variable comparisons, arithmetics and variable testing in various
-PHP versions
+* [PHP Cheatsheets](http://phpcheatsheets.com/) - for variable comparisons, arithmetics and variable testing in various PHP versions.
+* [Modern PHP Cheatsheet](https://github.com/smknstd/modern-php-cheatsheet) documents modern (PHP 7.0+) idioms in a unified document.
 * [OWASP Security Cheatsheets](https://www.owasp.org/index.php/OWASP_Cheat_Sheet_Series) - provides a concise collection of high value information on specific application security topics. 
 
 ### More best practices