Update changelog for the 0.0.9 release

Author: Rémi Lapeyre

CHANGELOG.md

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+## 0.0.9
+### April 22, 2022
+
+NEW FEATURES:
+
+* The `dns_resolvers` parameter can now be set to choose the DNS resolvers used to check the propagation of the ACME DNS-01 challenge.
+
+## 0.0.8
+### July 04, 2021
+
+IMPROVEMENTS:
+
+* Better error message are now returned when a certificate signing request fails.
+
+## 0.0.7
+### May 16, 2020
+
+IMPROVEMENTS:
+
+* It is now possible to update an ACME account.
+
+## 0.0.6
+### August 19, 2020
+
+IMPROVEMENTS:
+
+* Simultanous requests to create the same certificate will now return the same one to avoid sending multiple requests to the ACME provider.
+* The `provider_configuration` parameter can now be used to set the configuration of the ACME client instead of using environment variables.
+
+## 0.0.5
+### August 12, 2020
+
+BUG FIXES:
+
+* Failure to retrieve the Lego client now properly return an error.
+
+## 0.0.4
+### July 22, 2020
+
+NEW FEATURES:
+
+* It is now possible to ignore skip waiting for the DNS propagation by setting the `ignore_dns_propagation` parameter on an account. The default is `false` and will check that the ACME DNS challenge has been properly propagated before requesting a certificate.
+
+## 0.0.3
+### May 18, 2020
+
+NEW FEATURES:
+
+* It is now possible to set the type of key used for an account by setting the `key_type` parameter. Possible values are `EC256`, `EC384`, `RSA2048`, `RSA4096` and `RSA8192`.
+
+
+## 0.0.2
+### May 07, 2020
+
+BUG FIXES:
+
+* The binaries are now statically built to work with Alpine Linux.
+
+
+## 0.0.1
+### May 06, 2020
+
+NEW FEATURES:
+
+* Initial release of the Vault ACME secret engine.