message: Added docs for HampelFilterVisitor
diff: @@ -340,7 +340,7 @@ table.hovertable td {
  <tr onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
  <td title="Loads index column"><a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/load_index.html">load_index</a>( 2 )</td>
  - <td></td>
  + <td title="Specification for Hampel filter">enum class <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/HampelFilterVisitor.html">hampel_type</a>{ }</td>
  <td title="Visitor adopter for rolling">struct <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/SimpleRollAdopter.html">SimpleRollAdopter</a>{ }</td>
  <td></td>
  </tr>
  @@ -474,7 +474,7 @@ table.hovertable td {
  <tr onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
  <td title="Shifts data up or dowm in self"><a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/self_shift.html">self_shift</a>( )</td>
  <td></td>
  - <td></td>
  + <td title="Applies Hampel filter to column data">struct <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/HampelFilterVisitor.html">HampelFilterVisitor</a>{ }</td>
  <td></td>
  </tr>
  