Twilio

----------------------------
**Api**
- Pass Twiml in call update request

**Conversations**
- Add attributes to Conversations resources

**Flex**
- Adding `features_enabled` and `serverless_service_sids` to Flex Configuration

**Messaging**
- Message API required params updated **(breaking change)**

**Preview**
- Added support for the optional `CallSid` to `/BrandedCalls` endpoint

----------------------------
**Library**
- [PR 474](https://github.com/twilio/twilio-python/pull/474): Use PyJWT version >= 1.4.2 in requirements.txt. Thanks to [storymode7](https://github.com/storymode7)!
- [PR 473](https://github.com/twilio/twilio-python/pull/473): Update the IP messaging domain name to be 'chat'. Thanks to [childish-sambino](https://github.com/childish-sambino)!

**Conversations**
- Add Chat Conversation SID to conversation default output properties

**Flex**
- Adding `outbound_call_flows` object to Flex Configuration
- Adding read and fetch to channels API

**Supersim**
- Add Sims and Commands resources for the Super Sim Pilot

**Sync**
- Added configuration option for enabling webhooks from REST.

**Wireless**
- Added `usage_notification_method` and `usage_notification_url` properties to `rate_plan`.

**Twiml**
- Add support for `ach-debit` transactions in `Pay` verb

----------------------------
**Preview**
- Added support for the header `Twilio-Sandbox-Mode` to mock all Voice dependencies

**Twiml**
- Add support for `<Siprec>` noun
- Add support for `<Stream>` noun
- Create verbs `<Start>` and `<Stop>`

----------------------------
**Insights**
- Added `properties` to summary.

**Preview**
- Added endpoint to brand a call without initiating it, so it can be initiated manually by the Customer

**Twiml**
- Update `<Conference>` recording events **(breaking change)**

----------------------------
**Api**
- Make `friendly_name` optional for applications create
- Add new property `as_of` date to Usage Record API calls

**Wireless**
- Added Usage Records resource.

----------------------------
**Autopilot**
- Adds two new properties in Assistant i.e needs_model_build and development_stage

**Preview**
- Changed phone numbers from _URL|Path_ to `X-XCNAM-Sensitive` headers **(breaking change)**

**Verify**
- Add `MessagingConfiguration` resource to verify service