Adding the missing "for" between "Thank you" and "up"

close #444

browserid/views/verifyuser.ejs

@@ -49,7 +49,7 @@
     </form>
     
     <div id="congrats">
-        <p class="serif">Thank you signing up with <strong>BrowserID</strong>. You can now use your <strong>BrowserID</strong> account to <em>Sign In</em> or <em>Sign Up</em> to websites all across the web!</p>
+        <p class="serif">Thank you for signing up with <strong>BrowserID</strong>. You can now use your <strong>BrowserID</strong> account to <em>Sign In</em> or <em>Sign Up</em> to websites all across the web!</p>
     </div>
       
   </div>