bumped version to 4.0

Author: jstucke

src/version.py

@@ -16,4 +16,4 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 '''
 
-__VERSION__ = '4.0-dev'
+__VERSION__ = '4.0'

src/web_interface/templates/about.html

@@ -54,7 +54,7 @@ <h3 class="my-4">Change Log</h3>
 
 <div class="row justify-content-center">
     <div class="col-xl-8 col-lg-12" style="width:100%;column-count:2;column-rule:grey 1px dotted;column-gap:50px">
-        <h4>FACT 4.0-dev</h4>
+        <h4>FACT 4.0 (2022-07-21)</h4>
         <ul>
             <li>
                 <i class="fas fa-exclamation-triangle" style="color: red;"></i>