doc: updates for repmgr 5.x and PostgreSQL 12

doc/appendix-release-notes.xml

@@ -18,7 +18,7 @@
 <!-- remember to update the release date in ../repmgr_version.h.in -->
 
   <sect1 id="release-5.0">
-    <title>Release 5.0</title>
+    <title id="release-current">Release 5.0</title>
     <para><emphasis>?? ???, 2019</emphasis></para>
 
     <sect2>
@@ -124,7 +124,7 @@
   </sect1>
 
   <sect1 id="release-4.4">
-    <title id="release-current">Release 4.4</title>
+    <title>Release 4.4</title>
     <para><emphasis>27 June, 2019</emphasis></para>
 
     <para>

doc/install-requirements.xml

@@ -109,12 +109,25 @@
         </thead>
 
         <tbody>
+
+          <row>
+            <entry>
+              &repmgr; 5.x
+            </entry>
+            <entry>
+              <link linkend="release-current">&repmgrversion;</link> (&releasedate;)
+            </entry>
+            <entry>
+              9.3, 9.4, 9.5, 9.6, 10, 11, 12
+            </entry>
+          </row>
+
           <row>
             <entry>
               &repmgr; 4.x
             </entry>
             <entry>
-              <link linkend="release-current">&repmgrversion;</link> (&releasedate;)
+              <link linkend="release-4.4">4.4</link> (27 June, 2019)
             </entry>
             <entry>
               9.3, 9.4, 9.5, 9.6, 10, 11

doc/repmgr.xml

@@ -26,7 +26,7 @@
   <abstract>
    <para>
    This is the official documentation of &repmgr; &repmgrversion; for
-   use with PostgreSQL 9.3 - PostgreSQL 11.
+   use with PostgreSQL 9.3 - PostgreSQL 12.
    </para>
    <para>
      &repmgr; is being continually developed and we strongly recommend using the