function to add h-entry to post class

functions.php

function my_post_classes( $classes ) {
		$classes = array_diff( $classes, array( 'hentry' ) );
		
			if ( 'page' !== get_post_type() ) {
				// Adds a class for microformats v2
				$classes[] = 'h-entry';
				// add hentry to the same tag as h-entry
				$classes[] = 'hentry';
			}
		
		return $classes;
	}

add_filter( 'post_class', 'my_post_classes' );