MDL-56007 lib: Update readme_moodle.txt and thirdpartylibs.xml

lib/jquery/plugins.php

@@ -37,6 +37,6 @@
 
 $plugins = array(
     'jquery'  => array('files' => array('jquery-3.1.0.min.js')),
-    'ui'      => array('files' => array('ui-1.11.4/jquery-ui.min.js')),
-    'ui-css'  => array('files' => array('ui-1.11.4/theme/smoothness/jquery-ui.min.css')),
+    'ui'      => array('files' => array('ui-1.12.1/jquery-ui.min.js')),
+    'ui-css'  => array('files' => array('ui-1.12.1/theme/smoothness/jquery-ui.min.css')),
 );

lib/jquery/readme_moodle.txt

@@ -5,6 +5,7 @@ Description of import of various jQuery libraries into Moodle:
 
 2/ download jQuery UI files from http://jqueryui.com/download/all/,
    delete old files and edit plugins.php and lib/requirejs/moodle-config.js
+   delete unnecessary files: external folder, index.html, AUTHORS.txt, package.json and any css or js files not minified
 
 3/ download all UI themes and update smoothness theme
 

lib/thirdpartylibs.xml

@@ -165,7 +165,7 @@
     <location>jquery</location>
     <name>jQuery UI</name>
     <license>MIT</license>
-    <version>1.11.4</version>
+    <version>1.12.1</version>
     <licenseversion></licenseversion>
   </library>
   <library>