update version of node and yarn

Author: mor-n4

downloads.html

@@ -240,10 +240,10 @@ <h2 id ="Required_Versions">Required Versions</h2>
             <a href="https://adoptopenjdk.net/" target="_blank">Java 11</a>
           </li>
           <li>
-            <a href="https://nodejs.org/en/download/" target="_blank">Node.js 10.13</a>
+            <a href="https://nodejs.org/en/download/" target="_blank">Node.js 12.13.x</a>
           </li>
           <li>
-            <a href="https://yarnpkg.com/en/docs/install" target="_blank">Yarn 1.13.0</a>
+            <a href="https://yarnpkg.com/en/docs/install" target="_blank">Yarn 1.19.x</a>
           </li>
           <li>
             Eclipse Product Version: <a href="https://www.eclipse.org/downloads/" target="_blank">Eclipse 2019-09 release</a>