Cloudflare-dyndns

In case of errors, the next update can work incorrectly.
Delete the cache in these cases to avoid update errors.
For explanation, see: 38

- When the API Token is invalid, the script will print a better error message.
- There is a new `--verify-token` option to check if the token is valid beforehand, which lists the zones the token have access to.
- Added `--api-token-file` option: You can now read the API Token from a file.
The file should contain only the token, without any newline characters.

Thanks jfly for this feature!

The Cloudflare IP tracing service (https://1.1.1.1/cdn-cgi/trace) doesn't work anymore (or at least unreliable), it's returning 403.
Changed the default IP service to https://api.ipify.org .

As I'm using v5.0beta5 every day for more than a year now, it was time to release the final v5.0 version 😃

You can install it from Docker Hub, PyPI as before, and even from Nix!

- Support for Trust stores other than Linux.
- Better IPv6 support
- Don't save cache to disk when nothing changed. See 25
- Updated dependencies

Don't save cache to disk when nothing changed. See 25

- Support for Trust stores other than Linux.
- Better IPv6 support