CSS class is not applied anymore after updating to v2.1.0

I’ve just updated the plugin to the newest version, and now the css classes that I had applied to the form fields are not rendered in the output html anymore. Before update they where there like this:

<div class="fpf-field fpf-text">
<p class="form-row text-card-name-from" id="fpf_2692890_field" data-priority="" style="">

Now, after updating the plugin the output lacks the custom class:

<div class="fpf-field fpf-text">
<p class="form-row" id="fpf_2692890_field" data-priority="" style="">

Is this a bug?