Cloudns-api

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* Increments version after the previous version to revert back to preventing
installation on Python 2.

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* Released with a better way to warn Python 2 users that this library only
works in Python 3. The previous version failed with a confusing error
message.

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* Adds notice that this library must be run with Python 3.

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* Version 1 Release candidate.
* Adds support for checking if a DNS zone is updated (`is_updated`).
* Updates error handling in `publish` script.

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* Fourth Beta Release.
* Adds support for TLSA records.
* Minor fixes and tweaks to documentation for clarification.
* Fixes a bug where tests required auth environment variables to be set in
order to run successfully.

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* Third Beta Release.
* Adds DNS Support for zones (Thanks to
`kristinn <https://github.com/kristinn>`__).
* Allows authentication with sub-users through environment variables
'CLOUDNS_API_SUB_AUTH_ID' or 'CLOUDNS_API_SUB_AUTH_USER'. (Thanks to
`sadimusi <https://github.com/sadimusi>`__).