Release v5.2.1

• Bump prestashop/php-dev-tools from 4.2.1 to 4.3.0 by @dependabot in #68
• Updated README.md by @BitcoinMitchell in #71
• Added version checking for the module by @BitcoinMitchell in #73

Full Changelog: v5.2.0...v5.2.1