Readme: Update the recommended PHP version to 5.6.

This also includes a unit test to ensure we're only recommending actively supported versions of PHP in the future.

Fixes #33758.


Built from https://develop.svn.wordpress.org/trunk@33937


git-svn-id: http://core.svn.wordpress.org/trunk@33906 1a063a9b-81f0-0310-95a4-ce76da25c4cd

readme.html

@@ -59,7 +59,7 @@
 
 <h2>Recommendations</h2>
 <ul>
-	<li><a href="http://php.net/">PHP</a> version <strong>5.4</strong> or higher.</li>
+	<li><a href="http://php.net/">PHP</a> version <strong>5.6</strong> or higher.</li>
 	<li><a href="http://www.mysql.com/">MySQL</a> version <strong>5.5</strong> or higher.</li>
 	<li>The <a href="http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html">mod_rewrite</a> Apache module.</li>
 	<li>A link to <a href="https://wordpress.org/">wordpress.org</a> on your site.</li>

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33936';
+$wp_version = '4.4-alpha-33937';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.