Merge pull request #603 from matks/hacktoberfest1

Update link to contribution guidelines

README.md

@@ -58,5 +58,5 @@ This module is released under the [Academic Free License 3.0][AFL-3.0]
 
 [report-issue]: https://github.com/PrestaShop/PrestaShop/issues/new/choose
 [prestashop]: https://www.prestashop-project.org/
-[contribution-guidelines]: https://devdocs.prestashop.com/1.7/contribute/contribution-guidelines/project-modules/
+[contribution-guidelines]: https://devdocs.prestashop-project.org/8/contribute/contribution-guidelines/project-modules/
 [AFL-3.0]: https://opensource.org/licenses/AFL-3.0