chore(deps): update dependency twilio to v6.37.0 (GoogleCloudPlatform#3203)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [twilio](https://togithub.com/twilio/twilio-python) | minor | `==6.35.1` -> `==6.37.0` |

---

### Release Notes


twilio/twilio-python

### [`v6.37.0`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-03-18-Version-6370)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.36.0...6.37.0)

**Api**

-   Add optional `emergency_calling_enabled` parameter to SIP Domain
-   Add optional property `call_reason` in the call create request

**Authy**

-   Added `friendly_name` and `config` as optional params to Factor update
-   Added `config` param to Factor creation **(breaking change)**

**Preview**

-   Renamed `SuccessRate` endpoint to `ImpressionsRate` for Branded Calls (fka. Verified by Twilio) **(breaking change)**

### [`v6.36.0`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-03-04-Version-6360)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.35.5...6.36.0)

**Library - Feature**

-   [PR #&GoogleCloudPlatform#8203;507](https://togithub.com/twilio/twilio-python/pull/507): add new max_retries param to TwilioHttpClient. Thanks to [@&GoogleCloudPlatform#8203;msaelices](https://togithub.com/msaelices)!

**Authy**

-   Added the `configuration` property to services to return the service level configurations
-   Added optional parameter `Push` when creating a service to send the service level push factor configuration
-   Remove FactorStrength support for Factors and Challenges **(breaking change)**

**Messaging**

-   Correct the alpha sender capabilities property type **(breaking change)**

**Preview**

-   Removed `/Devices` register Branded Calls endpoint, as per iOS sample app deprecation **(breaking change)**
-   Removed `Twilio-Sandbox-Mode` request header from the Branded Calls endpoints, as not officially supported **(breaking change)**
-   Removed `Verify` version from `preview` subdomain in favor to `verify` subdomain. **(breaking change)**

**Serverless**

-   Add UI-Editable field to Services

**Supersim**

-   Add `inactive` status for Super SIM which is an alias for `deactivated`

**Taskrouter**

-   Adding value range to `priority` in task endpoint

**Verify**

-   Fix `SendCodeAttempts` type. It's an array of objects instead of a unique object. **(breaking change)**

### [`v6.35.5`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-02-19-Version-6355)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.35.4...6.35.5)

**Api**

-   Make call create parameters `async_amd`, `async_amd_status_callback`, and `async_amd_status_callback_method` public
-   Add `trunk_sid` as an optional field to Call resource fetch/read responses
-   Add property `queue_time` to successful response of create, fetch, and update requests for Call
-   Add optional parameter `byoc` to conference participant create.

**Authy**

-   Added support for challenges associated to push factors

**Flex**

-   Adding `ui_dependencies` to Flex Configuration

**Messaging**

-   Deprecate Session API **(breaking change)**

**Numbers**

-   Add Regulations API

**Studio**

-   Add Execution and Step endpoints to v2 API
-   Add webhook_url to Flow response and add new /TestUsers endpoint to v2 API

**Taskrouter**

-   Adding `longest_relative_task_age_in_queue` and `longest_relative_task_sid_in_queue` to TaskQueue Real Time Statistics API.
-   Add `wait_duration_in_queue_until_accepted` aggregations to TaskQueues Cumulative Statistics endpoint
-   Add TaskQueueEnteredDate property to Tasks.

**Video**

-   [Composer] Clarification for the composition hooks creation documentation: one source is mandatory, either the `audio_sources` or the `video_layout`, but one of them has to be provided
-   [Composer] `audio_sources` type on the composer HTTP POST command, changed from `sid[]` to `string[]` **(breaking change)**
-   [Composer] Clarification for the composition creation documentation: one source is mandatory, either the `audio_sources` or the `video_layout`, but one of them has to be provided

### [`v6.35.4`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-02-05-Version-6354)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.35.3...6.35.4)

**Api**

-   Making content retention and address retention public
-   Update `status` enum for Messages to include 'partially_delivered'

**Authy**

-   Added support for push factors

**Autopilot**

-   Add one new property in Query i.e dialogue_sid

**Verify**

-   Add `SendCodeAttempts` to create verification response.

**Video**

-   Clarification in composition creation documentation: one source is mandatory, either `audio_sources` or `video_layout`, but on of them has to be provided

**Twiml**

-   Add Polly Neural voices.

### [`v6.35.3`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-01-22-Version-6353)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.35.2...6.35.3)

**Library - Docs**

-   [PR #&GoogleCloudPlatform#8203;504](https://togithub.com/twilio/twilio-python/pull/504): baseline all the templated markdown docs. Thanks to [@&GoogleCloudPlatform#8203;childish-sambino](https://togithub.com/childish-sambino)!

**Api**

-   Add payments public APIs
-   Add optional parameter `byoc` to call create request.

**Flex**

-   Updating a Flex Flow `creation_on_message` parameter documentation

### [`v6.35.2`](https://togithub.com/twilio/twilio-python/blob/master/CHANGES.md#​2020-01-08-Version-6352)

[Compare Source](https://togithub.com/twilio/twilio-python/compare/6.35.1...6.35.2)

**Numbers**

-   Add Regulatory Compliance CRUD APIs

**Studio**

-   Add parameter validation for Studio v2 Flows API

**Twiml**

-   Add support for `speech_model` to `Gather` verb



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appengine/flexible/twilio/requirements.txt

@@ -1,3 +1,3 @@
 Flask==1.1.1
 gunicorn==20.0.4
-twilio==6.35.1
+twilio==6.37.0