Update README.md

[taskul]

These API are no longer working: Cataas NoPhishy Améthyste Pixel Encounter British National Bibliography Micro Weather

This API PostNord was changed: from https://developer.postnord.com/api to https://developer.postnord.com/apis

• [ ] My submission is formatted according to the guidelines in the contributing guide
• [ ] My addition is ordered alphabetically
• [ ] My submission has a useful description
• [ ] The description does not have more than 100 characters
• [ ] The description does not end with punctuation
• [ ] Each table column is padded with one space on either side
• [ ] I have searched the repository for any relevant issues or pull requests
• [ ] Any category I am creating has the minimum requirement of 3 items
• [ ] All changes have been squashed into a single commit

[marcelscruz]

Thanks!