create a new changelog file for the next version

Author: vertigo17

source/src/main/resources/documentation/D2/documentation_en.adoc

@@ -285,3 +285,7 @@ include::include/en/{file-to-include}[]
 == 4.19
 :file-to-include: changelog_4.19_en.adoc
 include::include/en/{file-to-include}[]
+ 
+== 4.20
+:file-to-include: changelog_4.20_en.adoc
+include::include/en/{file-to-include}[]

source/src/main/resources/documentation/D2/include/en/changelog_4.20_en.adoc

@@ -0,0 +1,11 @@
+*Bug fixes*
+[square]
+* none
+
+*Improvements / New features*
+[square]
+* none
+
+*Warning to be considered before applying the version (deprecated features)*
+[square]
+* none

source/src/main/webapp/Homepage.jsp

@@ -258,11 +258,11 @@
                 <div class="col-lg-6">
                     <div id="ChangelogPanel">
                         <div class="panel panel-default whiteCard">
-                            <div class="panel-heading card" data-target="#Changelog41900">
+                            <div class="panel-heading card" data-target="#Changelog42000">
                                 <span class="fa fa-pie-chart fa-fw"></span>
                                 <label id="changelogLabel">Changelog</label>
                             </div>
-                            <div class="panel-body collapse in" id="Changelog41900">
+                            <div class="panel-body collapse in" id="Changelog42000">
                                 <iframe id="documentationFrame" style="width:100%" frameborder="0" scrolling="yes"/>
                                 </iframe>
                             </div>

source/src/main/webapp/js/pages/Homepage.js

@@ -135,10 +135,10 @@ $.when($.getScript("js/global/global.js")).then(function () {
         loadBuildRevTable();
 
         // Display Changelog;
-        $("#documentationFrame").attr("src", "./documentation/D2/changelog_4.19_en.html");
+        $("#documentationFrame").attr("src", "./documentation/D2/changelog_4.20_en.html");
         var windowsHeight = $(window).height() + 'px';
         $('#documentationFrame').css('height', '400px');
-        $("#changelogLabel").html("Changelog 4.19");
+        $("#changelogLabel").html("Changelog 4.20");
 
         //close all sidebar menu
         closeEveryNavbarMenu();