Duo-client

Changes:

- Dropping support for Python versions below 3.7.
- Fixed bug causing result paging to not work for certain endpoints (201).
- Added support for the [Policy v2 endpoint](https://duo.com/docs/adminapi#policy) (208).
- Added support for SNI for SSL/TLS connection (211).

Changes:

Added support for the [Telephony Logs v2 endpoint](https://duo.com/docs/adminapi#telephony-logs)

Changes:

- Minor fix up of string format
- Added support for SSO integrations operations
- Updated API authentication signing algorithm to Duo's preferred approach

Reverting the API authentication changes in 4.6.0 due to a bug.

Changes:
- Change from SHA1 to SHA512 for Duo API call authentication signing
- Fix various typos and comments
- Minor fix up of some code style issues
- Removed the deprecated constant PROTOCOL_SSLv23
- Added support for pending_deletion_days parameter for Settings operations
- Added support for SSO integrations operations
- Updated API authentication signing algorithm to Duo's preferred approach

- Add ability to update the status of Admins
- Add a way to get offline enrollment log events
- Add a way to get activity logs