Merge pull request 'templates/signup.html: user name must not be empty. Bug reported and fixed by 丁宇超. For more details, see http://118.25.96.118/bugzilla/show_bug.cgi?id=347 and http://118.25.96.118/kanboard/?controller=BoardViewController&action=show&project_id=183' (#21) from BugFix347 into master

Reviewed-on: http://121.4.94.30:3000/mrlan/EnglishPal/pulls/21

app/templates/signup.html

@@ -10,8 +10,8 @@ You're logged in already! <a href="/logout">Logout</a>.
 <p>Sign up here.</p>
 
 <form action="/signup" method="POST">
-  <p><input type="username" name="username" placeholder="邮箱地址、电话号码"></p>
-  <p><input type="password" name="password" placeholder="密码"></p>  
+  <p><input type="username" name="username" placeholder="邮箱地址、电话号码" required="required"></p>
+  <p><input type="password" name="password" placeholder="密码"></p>
   <p><input type="submit" value="注册"></p>
 </form>
 {% endif %}