title: Custom validation in CoreUI form is not working
body: <p>I am trying to add custom validation to my form on modal using coreui react but not able to get it to work. Getting below error</p>
  <p>Property 'noValidate' does not exist on type 'IntrinsicAttributes &amp; CFormProps &amp; RefAttributes'</p>
  <pre><code>     &lt;CModal    
      &lt;CForm noValidate validated={validated} onSubmit={handleAddFormSubmit} className=&quot;row&quot;&gt;
        &lt;div className=&quot;row&quot;&gt;
          &lt;div className=&quot;col-12&quot; style={{ paddingLeft: '25px' }}&gt;
            &lt;CFormInput
              className=&quot;mb-2&quot;
              type=&quot;text&quot;
              name=&quot;Username&quot;
              placeholder=&quot;Enter UserName...&quot;
              value={formData.UserName}
              onChange={handleAddFormChange}
              maxLength={2}
              required 
            /&gt;
            &lt;CFormFeedback invalid&gt;Please choose a username.&lt;/CFormFeedback&gt;              
            &lt;div /&gt;
         &lt;/div&gt;
         &lt;/CForm&gt;
    &lt;/CModal&gt;
  </code></pre>
  <p>Tried Below way too- getting below errors</p>
  <p>Property 'noValidate' does not exist on type 'IntrinsicAttributes &amp; CFormProps &amp; RefAttributes'
  Property 'feedbackInvalid' does not exist on type 'IntrinsicAttributes &amp; CFormProps &amp; RefAttributes'</p>
  <pre><code>&lt;CModal    
  &lt;CForm noValidate validated={validated} onSubmit={handleAddFormSubmit} className=&quot;row&quot;&gt;
    &lt;div className=&quot;row&quot;&gt;
      &lt;div className=&quot;col-12&quot; style={{ paddingLeft: '25px' }}&gt;
        &lt;CFormInput
          className=&quot;mb-2&quot;
          type=&quot;text&quot;
          name=&quot;Username&quot;
          placeholder=&quot;Enter UserName...&quot;
          value={formData.UserName}
          onChange={handleAddFormChange}
          maxLength={2}
          required 
          feedbackInvalid=&quot;Please provide a valid user name.&quot;
        /&gt;             
        &lt;div /&gt;
     &lt;/div&gt;
     &lt;/CForm&gt;
  </code></pre>