Add version and release date to renderer

src/renderer/scr.gui.js

@@ -38,6 +38,7 @@ var GUI = (function(){
     
     showModal(560, [
       "<p>Discord History Tracker is developed by <a href='https://chylex.com'>chylex</a> as an <a href='"+linkGH+"/blob/master/LICENSE.md'>open source</a> project.</p>",
+      "<sub>BETA v.2, released 31 May 2015</sub>",
       "<p>Please, report any issues and suggestions to the <a href='"+linkGH+"/issues'>tracker</a>. If you want to support the development, please spread the word and consider <a href='https://www.patreon.com/chylex'>becoming a patron</a>. Any support is appreciated!</p>",
       "<p>",
       "<a href='"+linkGH+"/issues'>Issue Tracker</a> &nbsp;&mdash;&nbsp; ",

src/renderer/stl.modal.css

@@ -36,6 +36,11 @@
   margin-bottom: 1px;
 }
 
+#dialog sub {
+  color: #999;
+  font-size: 12px;
+}
+
 #dialog a {
   color: #0096CF;
   text-decoration: none;