Twilio

---------------------------
**Library**
- Remove bundled certificates, use `certifi` package via `requests`.
- Add option to use connection pooling. This is enabled by default and will use one Session for all requests
in Client.
- To disable this, pass `pool_connections` parameter when creating your Twilio client.
python
from twilio.rest import Client
from twilio.http.http_client import TwilioHttpClient

client = Client(
username,
password,
http_client=TwilioHttpClient(pool_connections=False)
)


**Api**
- Add VoiceReceiveMode {'voice', 'fax'} option to IncomingPhoneNumber UPDATE requests

**Chat**
- Add channel message media information
- Add service instance message media information

**Preview**
- Removed 'email' from bulk_exports configuration api [bi]. No migration plan needed because api has not been used yet.
- Add DeployedDevices.

**Sync**
- Add support for Service Instance unique names

---------------------------
Fixed PyJWT >= 1.5.1 exception


**Api**
- Add New wireless usage keys added
- Add `auto_correct_address` param for Addresses create and update
- Add ChatGrant grant and deprecate IpMessagingGrant

**Video**
- Add `video_codec` enum and `video_codecs` parameter, which can be set to either `VP8` or `H264` during room creation.
- Restrict recordings page size to 100

---------------------------
This release adds Beta and Preview products to main artifact.

Previously, Beta and Preview products were only included in the `alpha`
artifact. They are now being included in the main artifact to ease product
discoverability and the collective operational overhead of maintaining multiple
artifacts per library.

**Api**
- Remove unused `encryption_type` property on Recordings *(breaking change)*
- Update `status` enum for Messages to include 'accepted'

**Messaging**
- Fix incorrectly typed capabilities property for PhoneNumbers.

**Notify**
- Add `ToBinding` optional parameter on Notifications resource creation. Accepted values are json strings.

**Preview**
- Add `sms_application_sid` to HostedNumberOrders.

**Taskrouter**
- Fully support conference functionality in reservations.

---------------------------
**Api**
- Update `AnnounceMethod` parameter naming for consistency

**Notify**
- Add `ToBinding` optional parameter on Notifications resource creation. Accepted values are json strings.

**Preview**
- Add `verification_attempts` to HostedNumberOrders.
- Add `status_callback_url` and `status_callback_method` to HostedNumberOrders.

**Video**
- Filter recordings by date using the parameters `DateCreatedAfter` and `DateCreatedBefore`.
- Override the default time-to-live of a recording's media URL through the `Ttl` parameter (in seconds, default value is 3600).
- Add query parameters `SourceSid`, `Status`, `DateCreatedAfter` and `DateCreatedBefore` to the convenience method for retrieving Room recordings.

**Wireless**
- Added national and international data limits to the RatePlans resource.

--------------------------

- Pin PyJWT to below version `1.5.1` to fix broken build.
- Fix json load error for python 3.3 - 3.5

--------------------------

- Add several missing `<Gather>` attributes.
- `partial_result_callback`
- `partial_result_callback_method`
- `language`
- `hints`
- `barge_in`
- `acknowledge_sound_url`
- `input`
- Remove client-side max page size validation.
- Support `announce_url` and `announce_url_method` on Conference Participants.
- TwiML docstring corrections.