Update version string in about box

src/resources/html/about.html

 				<div class="topbanner">
 					<a href="http://www.randomfield.com/programs/typica/"><img src="../icons/appicons/logo96.png" height="96px" width="96px" alt="Typica logo" /></a>
 					<h1><a href="http://www.randomfield.com/programs/typica/">Typica</a></h1>
-					<h2>Version 1.6.4</h2>
+					<h2>Version 1.7.0</h2>
 				</div>
 			<div id="maintext">
 				<p>Copyright &copy; 2007&ndash;2016 Neal Evan Wilson