docs: change date

Author: rakieta2015

README.md

@@ -269,7 +269,7 @@ CoreUI Icons are beautifully crafted symbols for common actions and items. You c
 
 ## Copyright and license
 
-copyright 2019 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-laravel-admin-template/blob/master/LICENSE).
+copyright 2020 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-laravel-admin-template/blob/master/LICENSE).
 There is only one limitation you can't can’t re-distribute the CoreUI as stock. You can’t do this if you modify the CoreUI. In past we faced some problems with persons who tried to sell CoreUI based templates.
 
 ## Support CoreUI Development