Fix AnsibleModule supports_diff parameter (v1.3.1)

- Correct supports_diff_mode to supports_diff in nsupdate_zone.py
- This fixes: AnsibleModule.__init__() got an unexpected keyword argument 'supports_diff_mode'
- Bump version to 1.3.1

plugins/modules/nsupdate_zone.py

@@ -923,7 +923,7 @@ def main() -> None:
             dns_server=dict(type='str')
         ),
         supports_check_mode=True,
-        supports_diff_mode=True,
+        supports_diff=True,
         required_together=[
             ['key_name', 'key_secret']
         ]