Update release notes for 5.0.0.alpha1 (#844)

doc/releasenotes.html

@@ -475,7 +475,7 @@ <h1 id="release_notes_for_vaadin_testbench_version">Release Notes for Vaadin Tes
     <h2 id="overview_of_vaadin_testbench">Overview of Vaadin TestBench</h2>
 
     <p>Vaadin TestBench is a UI browser automation tool used for automated testing of Vaadin UIs in the browser. Vaadin
-        TestBench is based on Selenium 2 and provides a WebDriver based API for controlling different browsers on
+        TestBench is based on Selenium and provides a WebDriver based API for controlling different browsers on
         multiple platforms.</p>
 
     <h2 id="changes_since_2x">Changes in 5.0</h2>
@@ -516,7 +516,7 @@ <h2 id="package_contents">Package Contents</h2>
             <td>
                 <pre>vaadin-testbench-standalone-${project.version}.jar</pre>
             </td>
-            <td>This is the standalone version of the Vaadin TestBench library. It includes the Selenium 2 WebDriver
+            <td>This is the standalone version of the Vaadin TestBench library. It includes the Selenium WebDriver
                 along with all other dependencies and is suitable for running the grid hub and nodes. See the manual
                 for details.
             </td>
@@ -528,36 +528,37 @@ <h2 id="dependencies">Third Party Dependencies</h2>
 
     <p>All dependencies, along with their dependencies are bundled in <code>vaadin-testbench-standalone-${project.version}.jar</code>.
         The maven directory also contains <code>vaadin-testbench-${project.version}.jar</code>, which does not bundle
-        any dependencies. Vaadin TestBench 4 directly depends on the following third-party libraries:</p>
+        any dependencies. Vaadin TestBench 5 directly depends on the following third-party libraries:</p>
 
     <ul>
-        <li>Selenium 2.51.0</li>
-        <li>PhantomJSDriver 1.2.1</li>
+        <li>Selenium 3.0.1</li>
+        <li>PhantomJSDriver 1.3.0</li>
         <li>Javassist 3.18.1-GA</li>
         <li>JUnit 4.12</li>
-        <li>org.json</li>
     </ul>
 
     <h2 id="migration_notes">Migration Notes</h2>
 
-    <p>Vaadin TestBench 4 is API compatible with Vaadin TestBench 3.x, and can thus be used as a drop-in replacement for
-        any 3.x version. The exceptions to this rule are listed in the API changes section below.</p>
+    <p>Vaadin TestBench 5 is API compatible with Vaadin TestBench 4.x, and can thus be used as a drop-in replacement for
+        any 4.x version provided the tested project has been migrated to Vaadin Framework 8. The exceptions to this rule are listed in the API changes section below.</p>
 
     <h3 id="api_changes">API Changes</h3>
     <ul>
-        <li><tt>closeNotification()</tt> has been removed from TestBenchElement and is now <tt>NotificationElement.close()</tt></li>
+        <li><tt>CheckBoxGroupElement</tt> added to test <tt>CheckBoxGroup</tt> Component</li>
+        <li><tt>RadioButtonGroupElement</tt> added to test <tt>RadioButtonGroup</tt> Component</li>
+        <li>Elements for compatibility Components were deprecated</li>
     </ul>
 
     <h2 id="supported_platforms_and_browsers">Supported Platforms and Browsers</h2>
 
-    <p>Vaadin TestBench 4 fully supports Windows, Mac OS X and Linux as well as iOS and Android for running tests. The
+    <p>Vaadin TestBench 5 fully supports Windows, Mac OS X and Linux as well as iOS and Android for running tests. The
         following browsers are supported:</p>
 
     <ul>
         <li>Latest Google Chrome</li>
-        <li>Internet Explorer 8, 9, 10, 11</li>
+        <li>Internet Explorer 11</li>
         <li>Latest Microsoft Edge</li>
-        <li>Mozilla Firefox 47 and earlier</li>
+        <li>Mozilla Firefox</li>
         <li>Latest Safari</li>
         <li>Mobile browsers:
             <ul>