Twilio

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**Library**
- [PR 500](https://github.com/twilio/twilio-python/pull/500): feat: support http proxy in TwilioHttpClient. Thanks to [thehackercat](https://github.com/thehackercat)!

**Api**
- Make `twiml` conditional for create. One of `url`, `twiml`, or `application_sid` is now required.
- Add `bundle_sid` parameter to /IncomingPhoneNumbers API
- Removed discard / obfuscate parameters from ContentRetention, AddressRetention **(breaking change)**

**Chat**
- Added `last_consumed_message_index` and `last_consumption_timestamp` parameters in update method for UserChannel resource **(breaking change)**

**Conversations**
- Add Participant SID to Message properties

**Messaging**
- Fix incorrectly typed capabilities property for ShortCodes. **(breaking change)**

---------------------------
**Library**
- [PR 501](https://github.com/twilio/twilio-python/pull/501): BREAKING CHANGE feat: add custom HTTP header support. Thanks to [eshanholtz](https://github.com/eshanholtz)! **(breaking change)**
- [PR 502](https://github.com/twilio/twilio-python/pull/502): fix: regenerate python lib with yoyodyne refactor. Thanks to [eshanholtz](https://github.com/eshanholtz)!
- [PR 499](https://github.com/twilio/twilio-python/pull/499): docs: add supported language versions to README. Thanks to [childish-sambino](https://github.com/childish-sambino)!

**Api**
- Add optional `twiml` parameter for call create

**Chat**
- Added `delete` method in UserChannel resource

**Conversations**
- Allow Messaging Service update

**Taskrouter**
- Support ReEvaluateTasks parameter on Workflow update

**Twiml**
- Remove unsupported `mixed_track` value from `<Stream>` **(breaking change)**
- Add missing fax `<Receive>` optional attributes

---------------------------
**Library**
- [PR 498](https://github.com/twilio/twilio-python/pull/498): docs: Add local testing docs. Thanks to [childish-sambino](https://github.com/childish-sambino)!
- [PR 497](https://github.com/twilio/twilio-python/pull/497): fix: Resolve some bug risks and code quality issues. Thanks to [sanketsaurav](https://github.com/sanketsaurav)!
- [PR 495](https://github.com/twilio/twilio-python/pull/495): Rename child twiml methods to be the tag name and deprecate old methods. Thanks to [eshanholtz](https://github.com/eshanholtz)!
- [PR 490](https://github.com/twilio/twilio-python/pull/490): fix: Change ObsoleteException to inherit from Exception instead of BaseException. Thanks to [fefi95](https://github.com/fefi95)!

**Api**
- Make `persistent_action` parameter public
- Add `twiml` optional private parameter for call create
- Update the call `price` property type to be string **(breaking change)**

**Autopilot**
- Add Export resource to Autopilot Assistant.

**Flex**
- Added Integration.RetryCount attribute to Flex Flow
- Updating a Flex Flow `channel_type` options documentation

**Insights**
- Added edges to events and metrics
- Added new endpoint definitions for Events and Metrics

**Messaging**
- **create** support for sender registration
- **fetch** support for fetching a sender
- **update** support for sender verification

**Supersim**
- Add `Direction` filter parameter to list commands endpoint
- Allow filtering commands list by Sim Unique Name
- Add `Iccid` filter parameter to list sims endpoint

**Twiml**
- Add support for `<Refer>` verb

---------------------------
**Library**
- [PR 414](https://github.com/twilio/twilio-python/pull/414): Add support for passing custom logger into TwilioHttpClient. Thanks to [tysonholub](https://github.com/tysonholub)!
- [PR 423](https://github.com/twilio/twilio-python/pull/423): Document exception case in README. Thanks to [prateem](https://github.com/prateem)!
- [PR 489](https://github.com/twilio/twilio-python/pull/489): Include the license file when packaging the library. Thanks to [marcelotrevisani](https://github.com/marcelotrevisani)!
- [PR 485](https://github.com/twilio/twilio-python/pull/485): Adding timeout to TwilioHttpClient constructor. Thanks to [Kerl1310](https://github.com/Kerl1310)!
- [PR 488](https://github.com/twilio/twilio-python/pull/488): Update resources after sorting. Thanks to [childish-sambino](https://github.com/childish-sambino)!
- [PR 486](https://github.com/twilio/twilio-python/pull/486): Declare support for Python 3.8. Thanks to [Jamim](https://github.com/Jamim)!

**Api**
- Add new usage categories to the public api `sms-messages-carrierfees` and `mms-messages-carrierfees`

**Conversations**
- Add ProjectedAddress to Conversations Participant resource

**Preview**
- Implemented different `Sid` for Current Calls (Verified by Twilio), instead of relying in `Call.Sid` from Voice API team **(breaking change)**

**Supersim**
- Add List endpoint to Commands resource for Super Sim Pilot
- Add UsageRecords resource for the Super Sim Pilot
- Add List endpoint to UsageRecords resource for the Super Sim Pilot
- Allow assigning a Sim to a Fleet by Fleet SID or Unique Name for Super SIM Pilot
- Add Update endpoint to Fleets resource for Super Sim Pilot
- Add Fetch endpoint to Commands resource for Super Sim Pilot
- Allow filtering the Sims resource List endpoint by Fleet
- Add List endpoint to Fleets resource for Super Sim Pilot

**Wireless**
- Added `account_sid` to Sim update parameters.

**Twiml**
- Add new locales and voices for `Say` from Polly

---------------------------
**Library**
- [PR 482](https://github.com/twilio/twilio-python/pull/482): Update a few property types in the lookups and trunking responses. Thanks to [childish-sambino](https://github.com/childish-sambino)!
- [PR 483](https://github.com/twilio/twilio-python/pull/483): Update instance property marshaling to allow missing properties. Thanks to [childish-sambino](https://github.com/childish-sambino)!
- [PR 484](https://github.com/twilio/twilio-python/pull/484): Feature/remove socks dependency. Thanks to [Kerl1310](https://github.com/Kerl1310)!
- [PR 481](https://github.com/twilio/twilio-python/pull/481): Change typehint for `PhoneNumberInstance.carrier`. Thanks to [NCPlayz](https://github.com/NCPlayz)!
- [PR 480](https://github.com/twilio/twilio-python/pull/480): Auto-deploy via Travis CI upon tagged commit to master. Thanks to [thinkingserious](https://github.com/thinkingserious)!
- [PR 479](https://github.com/twilio/twilio-python/pull/479): breaking: Correct video composition date types. Thanks to [childish-sambino](https://github.com/childish-sambino)! **(breaking change)**

**Api**
- Add new property `attempt` to sms_messages
- Fixed a typo in the documentation for Feedback outcome enum **(breaking change)**
- Update the call price to be optional for deserializing **(breaking change)**

**Flex**
- Added `JanitorEnabled` attribute to Flex Flow
- Change `features_enabled` Flex Configuration key to private **(breaking change)**

**Supersim**
- Add Fetch endpoint to Fleets resource for Super Sim Pilot
- Allow assigning a Sim to a Fleet for Super Sim Pilot
- Add Create endpoint to Fleets resource for Super Sim Pilot

**Twiml**
- Update `<Conference>` rename "whisper" attribute to "coach" **(breaking change)**

---------------------------
**Library**
- [PR 477](https://github.com/twilio/twilio-python/pull/477): added validation of signature without stripping port number. Thanks to [eshanholtz](https://github.com/eshanholtz)!

**Conversations**
- Add media to Conversations Message resource

**Supersim**
- Add List endpoint to Sims resource for Super Sim Pilot