Maintainer guide

Prerequisites

Install automation tools
```
  pip install --upgrade nox-automation
```

Tasks

Install package with local modifications
```
  pip install -e .[samples]
```
Run lint tool
```
  nox -s lint
```
Run unit tests
```
  nox -s unittest
```
Create a new google_assistant_sdk release in dist
```
  nox -s release
```