Deprecate ACME v1 (#288)

* Deprecate ACME v1.

* Fix syntax error.

plugins/doc_fragments/acme.py

@@ -76,7 +76,8 @@ options:
          or C(2) for standardized ACME v2 endpoints."
       - "The default value is C(1). Note that in community.crypto 2.0.0, this
          option B(will be required) and will no longer have a default."
-      - "Please also note that we will deprecate ACME v1 support eventually."
+      - "The value C(1) is deprecated since community.crypto 2.0.0 and will be
+         removed from community.crypto 3.0.0."
     type: int
     choices: [ 1, 2 ]
   acme_directory:

plugins/module_utils/acme/acme.py

@@ -366,6 +366,10 @@ def create_backend(module, needs_acme_v2):
     if needs_acme_v2 and module.params['acme_version'] < 2:
         module.fail_json(msg='The {0} module requires the ACME v2 protocol!'.format(module._name))
 
+    if module.params['acme_version'] == 1:
+        module.deprecate("The value 1 for 'acme_version' is deprecated. Please switch to ACME v2",
+                         version='3.0.0', collection_name='community.crypto')
+
     # AnsibleModule() changes the locale, so change it back to C because we rely
     # on datetime.datetime.strptime() when parsing certificate dates.
     locale.setlocale(locale.LC_ALL, 'C')