Update version to 3.4

Author: gskinner

index.html

@@ -58,7 +58,7 @@
 			<div class="brand">
 				<svg class="icon logo inline"><use xlink:href="#RegExr"></use></svg>
 				RegExr
-				<span class="version">v3.3</span>
+				<span class="version">v3.4</span>
 			</div>
 			<ul class="file">
 				<li class="new">New</li>