add mongo optgroup
<optgroup id="optgroup-redis" label="Redis"></optgroup>
<optgroup id="optgroup-pgsql" label="PgSQL"></optgroup>
<optgroup id="optgroup-oracle" label="Oracle"></optgroup>
+ <optgroup id="optgroup-mongo" label="Mongo"></optgroup>
</select>
</div>
<div class="form-group">
