PHP Failed error: require() when opening a github repo in laravel

I am trying to run this repo from Github https://github.com/jeremykenedy/laravel-auth

When I get to step 6, I get this error. Is there anything I need to do? Seems as if the vendor folder is missing from my repo.

PS C:\Users\dunka\Documents\GitHub\laravel-auth> php artisan vendor:publish --tag=laravelro
PHP Warning:  require(C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php): failed to open stream: No such file or directory in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18

s\dunka\Documents\GitHub\laravel-auth\artisan on line 18
PHP Fatal error:  require(): Failed opening required 'C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18

Fatal error: require(): Failed opening required 'C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18
PS C:\Users\dunka\Documents\GitHub\laravel-auth> php artisan vendor:publish --tag=laravelroles
PHP Warning:  require(C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php): failed to open stream: No such file or directory in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18

s\dunka\Documents\GitHub\laravel-auth\artisan on line 18
PHP Fatal error:  require(): Failed opening required 'C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18

Fatal error: require(): Failed opening required 'C:\Users\dunka\Documents\GitHub\laravel-auth/vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\Users\dunka\Documents\GitHub\laravel-auth\artisan on line 18

via Chebli Mohamed