Twilio

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**Preview**
- Add `acc_security` (authy-phone-verification) initial api-definitions

**Taskrouter**
- [bi] Less verbose naming of cumulative and real time statistics

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**Chat**
- Make member accessible through identity
- Make channel subresources accessible by channel unique name
- Set get list 'max_page_size' parameter to 100
- Add service instance webhook retry configuration
- Add media message capability
- Make `body` an optional parameter on Message creation. *(breaking change)*

**Notify**
- `data`, `apn`, `gcm`, `fcm`, `sms` parameters in `Notifications` create resource are dicts/objects instead of strings. Passing manually stringified json will continue to work.

**Taskrouter**
- Add new query ability by TaskChannelSid or TaskChannelUniqueName
- Move Events, Worker, Workers endpoint over to CPR
- Add new RealTime and Cumulative Statistics endpoints

**Video**
- Create should allow an array of video_codecs.
- Add video_codecs as a property of room to make it externally visible.

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**Api**
- Add `sip_registration` property on SIP Domains
- Add new video and market usage category keys

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- Added last_response and last_request to http_client

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**Sync**
- Add support for Streams

**Wireless**
- Added DataSessions sub-resource to Sims.

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**Library**
- Allow creating AccessTokens/Jwts without generating `nbf`. Passing `None` in the constructor will remove `nbf` from jwt payload.

**Api**
- Update `status` enum for Recordings to include 'failed'
- Add `error_code` property on Recordings

**Chat**
- Add mutable parameters for channel, members and messages

**Video**
- New `media_region` parameter when creating a room, which controls which region media will be served out of.

**Twiml**
- Add support for `speech_timeout`, `max_speech_time`, and `profanity_filter` attributes on Gather verb.