v0.0.70

### Added

- Added `ExotelFrameSerializer` to handle telephony calls via Exotel.

- Added the option `informal` to `TranslationConfig` on Gladia config.  Allowing to force informal language forms when available.

- Added `CartesiaSTTService` which is a websocket based implementation to transcribe audio. Added a foundational example in `13f-cartesia-transcription.py`

- Added an `websocket` example, showing how to use the new Pipecat client `WebsocketTransport` to connect with Pipecat `FastAPIWebsocketTransport` or `WebsocketServerTransport`.

- Added language support to `RimeHttpTTSService`. Extended languages to include German and French for both `RimeTTSService` and `RimeHttpTTSService`.

### Changed

- Upgraded `daily-python` to 0.19.2.

- Make `PipelineTask.add_observer()` synchronous. This allows callers to call it before doing the work of running the `PipelineTask` (i.e. without invoking `PipelineTask.set_event_loop()` first).

- Pipecat 0.0.69 forced `uvloop` event loop on Linux on macOS. Unfortunately, this is causing issue in some systems. So, `uvloop` is not enabled by default anymore. If you want to use `uvloop` you can just set the `asyncio` event policy before starting your agent with:

```python
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
```

### Fixed

- Fixed an issue with various TTS services that would cause audio glitches at the start of every bot turn.

- Fixed an `ElevenLabsTTSService` issue where a context warning was printed when pushing a `TTSSpeakFrame`.

- Fixed an `AssemblyAISTTService` issue that could cause unexpected behavior when yielding empty `Frame()`s.

- Fixed an issue where `OutputAudioRawFrame.transport_destination` was being reset to `None` instead of retaining its intended value before sending the audio frame to `write_audio_frame`.

- Fixed a typo in Livekit transport that prevented initialization.