PubNub SDK v4.5.2 release.

PubNub SDK v4.5.1 release.

Merge pull request pubnub#91 from pubnub/develop

Version 4.5.0

Release v4.4.0

Merge pull request pubnub#84 from pubnub/develop

Version 4.2.1.

Merge pull request pubnub#84 from pubnub/develop

Version 4.2.1.

Version 4.2.0 (pubnub#81)

* Introduce 'delete' permission to Grant

* Implement v2 signatures. Update PAM endpoints to /v2. Update PAM tests to support v2 signatures and /v2 endpoints.

* Add TokenManager. Implement GrantToken method. Add cbor2 library to dependencies.

* Resolve test warnings due to use of deprecated method.

* Remove PAM audit tests. Resolve Codacy errors.

* Resolve logger deprecation warnings. Add delete_enabled field to PAMv2 Grant tests.

* Resolved import errors in older Python versions.

* Resolve unused variable warning.

* Add cbor2 dependency to PyPy.

* Prepare for release 4.1.8.

* Refactor token manager properties code.

* Update .pubnub.yml.

* Bumping minor version

 - David

Co-authored-by: Stefan QSD <41143293+stefan-qsd@users.noreply.github.com>
Co-authored-by: David Lin <48489922+davidnub@users.noreply.github.com>

Merge pull request pubnub#78 from pubnub/develop

Version 4.1.7

Release v4.1.6

Merge pull request pubnub#74 from pubnub/develop

Release version