fixed 2021 release dates
## 12.0.0b6 (Unreleased)
-## 12.0.0b5 (2020-03-09)
+## 12.0.0b5 (2021-03-09)
* This version and all future versions will require Python 2.7 or Python 3.6+, Python 3.5 is no longer supported.
* Adds SAS credential as an authentication option
* Bumps minimum requirement of `azure-core` to 1.10.0
* Adds support for datetime entities with milliseconds
* Adds support for Shared Access Signature authentication
-## 12.0.0b4 (2020-01-12)
+## 12.0.0b4 (2021-01-12)
* Fixes an [issue](https://github.com/Azure/azure-sdk-for-python/issues/15554) where `query_entities` kwarg `parameters` would not work with multiple parameters or with non-string parameters. This now works with multiple parameters and numeric, string, boolean, UUID, and datetime objects.
* Fixes an [issue](https://github.com/Azure/azure-sdk-for-python/issues/15653) where `delete_entity` will return a `ClientAuthenticationError` when the '@' symbol is included in the entity.
