Fix incorrect changelog version
## 1.0.0b6 (2021-03-09)
### Added
+- Added support for Azure Active Directory authentication.
- Added support for 1:N SMS messaging.
- Added support for SMS idempotency.
- Send method series in SmsClient are idempotent under retry policy.
- Send method takes in strings for phone numbers instead of `PhoneNumberIdentifier`.
- Send method returns a list of `SmsSendResult`s instead of a `SendSmsResponse`.
-## 1.0.0b5 (2021-02-09)
-### Added
-- Added support for Azure Active Directory authentication.
-
## 1.0.0b4 (2020-11-16)
- Updated `azure-communication-sms` version.
+
### Breaking Changes
- Replaced CommunicationUser with CommunicationUserIdentifier.
- Replaced PhoneNumber with PhoneNumberIdentifier.
