Added custom post in Pojo Recent Posts Widget

functions.php

/**
 * @param array $fields
 * @param WP_Widget $widget_obj
 *
 * @return array
 */
function pojo28831_add_custom_post_type_in_recent_posts_widget( $fields, $widget_obj ) {
	$fields[] = array(
		'id' => '_custom_post_type',
		'title' => __( 'Post Type:', 'pojo' ),
		'type' => 'select',
		'std' => '',
		'options' => array(
			'' => __( 'Post', 'pojo' ),
			'YOUR_CPT_SLUG' => __( 'Custom Post Type', 'pojo' ),
		),
		'filter' => array( &$widget_obj, '_valid_by_options' ),
	);

	return $fields;
}
add_filter( 'pojo_recent_posts_widget_fields_after_metadata', 'pojo28831_add_custom_post_type_in_recent_posts_widget', 10, 2 );

/**
 * @param array $query_args
 * @param array $instance
 *
 * @return string|array
 */
function pojo28831_change_query_args_for_custom_post_type( $query_args, $instance ) {
	if ( ! empty( $instance['_custom_post_type'] ) ) {
		$query_args['post_type'] = $instance['_custom_post_type'];
	}

	return $query_args;
}
add_filter( 'pojo_recent_posts_widget_query_args', 'pojo28831_change_query_args_for_custom_post_type', 10, 2 );