README: Fix typo in myretrostore.co.uk link#1

0cjs wants to merge 1 commit intoMyRetroStore:mainMyRetroStore/Commodore-PET-Universal-Dynamic:mainfrom

0cjs:dev/cjs/25h05/readme-fix0cjs/Commodore-PET-Universal-Dynamic:dev/cjs/25h05/readme-fixCopy head branch name to clipboard