[Certbot-dev] Certbot 1.18.0 Release

[Erica Portnoy]

Certbot 1.18.0 has just been released. The changelog for the release is:

## 1.18.0 - 2021-08-03

### Added

* New functions that Certbot plugins can use to interact with the user have
   been added to `certbot.display.util`. We plan to deprecate using 
`IDisplay`
   with `zope` in favor of these new functions in the future.
* The `Plugin`, `Authenticator` and `Installer` classes are added to
   `certbot.interfaces` module as alternatives to Certbot's current 
`zope` based
   plugin interfaces. The API of these interfaces is identical, but they are
   based on Python's `abc` module instead of `zope`. Certbot will 
continue to
   detect plugins that implement either interface, but we plan to drop 
support
   for `zope` based interfaces in a future version of Certbot.
* The class `certbot.configuration.NamespaceConfig` is added to the 
Certbot's
   public API.

### Changed

* When self-validating HTTP-01 challenges using
   acme.challenges.HTTP01Response.simple_verify, we now assume that the 
response
   is composed of only ASCII characters. Previously we were relying on the
   default behavior of the requests library which tries to guess the 
encoding of
   the response which was error prone.
* `acme`: the `.client.Client` and `.client.BackwardsCompatibleClientV2` 
classes
   are now deprecated in favor of `.client.ClientV2`.
* The `certbot.tests.patch_get_utility*` functions have been deprecated.
   Plugins should now patch `certbot.display.util` themselves in their 
tests or
   use `certbot.tests.util.patch_display_util` as a temporary workaround.
* In order to simplify the transition to Certbot's new plugin 
interfaces, the
   classes `Plugin` and `Installer` in `certbot.plugins.common` module and
   `certbot.plugins.dns_common.DNSAuthenticator` now implement Certbot's new
   plugin interfaces. The Certbot plugins based on these classes are now
   automatically detected as implementing these interfaces.
* We added a dependency on `chardet` to our acme library so that it will be
   used over `charset_normalizer` in newer versions of `requests`.

### Fixed

* The Apache authenticator no longer crashes with "Unable to insert label"
   when encountering a completely empty vhost. This issue affected 
Certbot 1.17.0.
* Users of the Certbot snap on Debian 9 (Stretch) should no longer 
encounter an
   "access denied" error when installing DNS plugins.

More details about these changes can be found on our GitHub repo.

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