title: Show Helper text below EditText along with the Hint
body: <p>I am trying to make something on these lines:</p>
  
  <p><a href="https://i.stack.imgur.com/1MpCm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/1MpCm.png" alt="EditText example"></a></p>
  
  <p>I am able to show the hint using <code>android:hint="Email Address"</code> but unable to show the helper text - <em>This will be your email username</em></p>
  
  <pre><code>    &lt;android.support.design.widget.TextInputLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;EditText
              android:id="@+id/et_username"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:ems="15"
              android:hint="Username"
              app:et_helper="Username is preferably your registered email"/&gt;
  
      &lt;/android.support.design.widget.TextInputLayout&gt;`
  </code></pre>
  
  <p>What I am getting is only and no <em>Username is preferably your registered email</em> below edittext:</p>
  
  <p><strong>Output:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/6bRTh.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6bRTh.png" alt="output"></a></p>
  
  <p>Any pointers appreciated. Thank you.</p>