Changed
* Update to `NotificationsAPIClient.get_template(id)`:
* the `dict` returned has changed, learn more from the [README](https://github.com/alphagov/notifications-python-client#get-a-template-by-id).
* Update to `NotificationsAPIClient.get_template_version(id, version)`:
* the `dict` returned has changed, learn more from the [README](https://github.com/alphagov/notifications-python-client#get-a-template-by-id-and-version).
* Update to `NotificationsAPIClient.get_all_templates(template_type=None)`:
* the `dict` returned has changed, learn more from the [README](https://github.com/alphagov/notifications-python-client#get-all-templates)
* Replaced `NotificationsAPIClient.get_template_preview(id)` function with `NotificationsAPIClient.post_template_preview(id, persionalisation)`:
* See more details here [README](https://github.com/alphagov/notifications-python-client#generate-a-preview-template)