[IMP] session_db: remove roadmap

It has been implemented.

session_db/README.rst

@@ -48,12 +48,6 @@ connection string, like ``postgres://user:passwd@server/db`` or ``db``.
 It is recommended to use a dedicated database for this module, and
 possibly a dedicated postgres user for additional security.
 
-Known issues / Roadmap
-======================
-
-This module does not work with multi-threaded workers, so it requires
-workers > 0.
-
 Bug Tracker
 ===========
 

session_db/static/description/index.html

@@ -377,11 +377,10 @@ <h1 class="title">Store sessions in DB</h1>
 <div class="contents local topic" id="contents">
 <ul class="simple">
 <li><a class="reference internal" href="#usage" id="toc-entry-1">Usage</a></li>
-<li><a class="reference internal" href="#known-issues-roadmap" id="toc-entry-2">Known issues / Roadmap</a></li>
-<li><a class="reference internal" href="#bug-tracker" id="toc-entry-3">Bug Tracker</a></li>
-<li><a class="reference internal" href="#credits" id="toc-entry-4">Credits</a><ul>
-<li><a class="reference internal" href="#authors" id="toc-entry-5">Authors</a></li>
-<li><a class="reference internal" href="#maintainers" id="toc-entry-6">Maintainers</a></li>
+<li><a class="reference internal" href="#bug-tracker" id="toc-entry-2">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="toc-entry-3">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="toc-entry-4">Authors</a></li>
+<li><a class="reference internal" href="#maintainers" id="toc-entry-5">Maintainers</a></li>
 </ul>
 </li>
 </ul>
@@ -394,30 +393,25 @@ <h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
 <p>It is recommended to use a dedicated database for this module, and
 possibly a dedicated postgres user for additional security.</p>
 </div>
-<div class="section" id="known-issues-roadmap">
-<h1><a class="toc-backref" href="#toc-entry-2">Known issues / Roadmap</a></h1>
-<p>This module does not work with multi-threaded workers, so it requires
-workers &gt; 0.</p>
-</div>
 <div class="section" id="bug-tracker">
-<h1><a class="toc-backref" href="#toc-entry-3">Bug Tracker</a></h1>
+<h1><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h1>
 <p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/server-tools/issues">GitHub Issues</a>.
 In case of trouble, please check there if your issue has already been reported.
 If you spotted it first, help us to smash it by providing a detailed and welcomed
 <a class="reference external" href="https://github.com/OCA/server-tools/issues/new?body=module:%20session_db%0Aversion:%2017.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
 <p>Do not contact contributors directly about support or help with technical issues.</p>
 </div>
 <div class="section" id="credits">
-<h1><a class="toc-backref" href="#toc-entry-4">Credits</a></h1>
+<h1><a class="toc-backref" href="#toc-entry-3">Credits</a></h1>
 <div class="section" id="authors">
-<h2><a class="toc-backref" href="#toc-entry-5">Authors</a></h2>
+<h2><a class="toc-backref" href="#toc-entry-4">Authors</a></h2>
 <ul class="simple">
 <li>Odoo SA</li>
 <li>ACSONE SA/NV</li>
 </ul>
 </div>
 <div class="section" id="maintainers">
-<h2><a class="toc-backref" href="#toc-entry-6">Maintainers</a></h2>
+<h2><a class="toc-backref" href="#toc-entry-5">Maintainers</a></h2>
 <p>This module is maintained by the OCA.</p>
 <a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
 <p>OCA, or the Odoo Community Association, is a nonprofit organization whose