Merge pull request #302 from brunolorente/readme-fix

Add missing slash in readme for the `require` calls

Author: pattonwebz

README.md

@@ -30,13 +30,13 @@ Open your WordPress themes **functions.php** file  `/wp-content/your-theme/funct
 
 ```php
 // Register Custom Navigation Walker
-require_once get_template_directory() . 'wp-bootstrap-navwalker.php';
+require_once get_template_directory() . '/wp-bootstrap-navwalker.php';
 ```
 
 If you encounter errors with the above code use a check like this to return clean errors to help diagnose the problem.
 
 ```php
-if ( ! file_exists( get_template_directory() . 'wp-bootstrap-navwalker.php' ) ) {
+if ( ! file_exists( get_template_directory() . '/wp-bootstrap-navwalker.php' ) ) {
 	// file does not exist... return an error.
 	return new WP_Error( 'wp-bootstrap-navwalker-missing', __( 'It appears the wp-bootstrap-navwalker.php file may be missing.', 'wp-bootstrap-navwalker' ) );
 } else {