### Add pca9641 Dependency to mix.exs

Source: https://github.com/jimsynz/pca9641/blob/main/README.md

Add the pca9641 package to your project's dependencies in mix.exs to install the driver.

```elixir
def deps do
  [
    {:pca9641, "~> 2.0.3"}
  ]
end
```

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