Twilio

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**Library**
- PR 429: Do not use ElementTree.__nonzero__; add test for mixed content. Thanks to ekarson!

**Api**
- Add Fraud Lookups category to usage records

**Video**
- Allow user to set `ContentDisposition` when obtaining media URLs for Room Recordings and Compositions
- Add Composition Settings resource

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**Library**
- PR 425: Allow adding TwiML children with generic tag names. Thanks to mbichoffe!
- PR 422: Allow adding text to TwiML nodes. Thanks to ekarson!
- PR 421: Add method to validate ssl certificate. Thanks to yannieyip!

**Twiml**
- Add methods to helper libraries to inject arbitrary text under a TwiML node

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**Lookups**
- Add back support for `fraud` lookup type

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**Library**
- PR 417: Migrate readme to rst and load it in with setup.py. Thanks to cjcodes!

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**Chat**
- Add Binding and UserBinding documentation

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**Library**
- PR 416: Remove Python 3.3 support. Thanks to cjcodes!

**Api**
- Add more programmable video categories to usage records
- Add 'include_subaccounts' parameter to all variation of usage_record fetch

**Studio**
- Add endpoint to delete engagements

**Trunking**
- Added cnam_lookup_enabled parameter to Trunk resource.
- Added case-insensitivity for recording parameter to Trunk resource.