title: bootstrap 4 show tabs doesn't work after first click
body: <p>I work with bootstrap 4 tabs for show form(content tab) like this: </p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div class="footer"&gt;
     &lt;div id="newsletter"&gt;
       &lt;div class="newsletter"&gt;
         &lt;div class="tabs"&gt;
           &lt;ul class="list-unstyled"&gt;
             &lt;li class="active"&gt;
               &lt;a href="#newsletter_email" data-toggle="tab" class="newsletter_email"&gt;&lt;/a&gt;
             &lt;/li&gt;
             &lt;li&gt;
               &lt;a href="#newsletter_mobile" data-toggle="tab" class="newsletter_mobile"&gt;&lt;/a&gt;
             &lt;/li&gt;
           &lt;/ul&gt;
         &lt;/div&gt;
         &lt;div class="tab-content"&gt;
           &lt;div class="tab-pane fade in active show" id="newsletter_email"&gt;
             &lt;div class="newsletter_frm"&gt;
               &lt;form class="ajax" action="" noscroll="yes"&gt;
                 &lt;input type="text" name="email" id="email" placeholder="email" class="newsletter_inp" error="" check="email" check_error=""&gt;
                 &lt;button type="submit" class="newsletter_btn"&gt;&lt;/button&gt;
               &lt;/form&gt;
             &lt;/div&gt;
           &lt;/div&gt;
           &lt;div class="tab-pane fade in" id="newsletter_mobile"&gt;
             &lt;div class="newsletter_frm"&gt;
               &lt;form class="ajax" action="" noscroll="yes"&gt;
                 &lt;input type="text" name="mobile" id="mobile" placeholder="mobile" class="newsletter_inp" error="" check="mobile" check_error=""&gt;
                 &lt;button type="submit" class="newsletter_btn"&gt;&lt;/button&gt;
               &lt;/form&gt;
             &lt;/div&gt;
           &lt;/div&gt;
         &lt;/div&gt;
       &lt;/div&gt;
     &lt;/div&gt;
   &lt;/div&gt;
  </code></pre>
  
  <p>Now, In action bootstrap tab only work in first change(click in icon for show content tab) and after this doesn't work. how do fix this problem?</p>
  
  <p><a href="https://jsfiddle.net/Alakian/w8yscfox/8/" rel="nofollow noreferrer">Demo HERE</a></p>