battery: add acpi requirement to README (#9116)

Co-authored-by: Marc Cornellà <marc.cornella@live.com>
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Samuel Terra 2020-07-18 13:45:59 -03:00 committed by GitHub
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@ -9,5 +9,14 @@ To use, add `battery` to the list of plugins in your `.zshrc` file:
Then, add the `battery_pct_prompt` function to your custom theme. For example:
```
RPROMPT='$(battery_pct_prompt)'
RPROMPT='$(battery_pct_prompt) ...'
```
## Requirements
On Linux, you must have the `acpi` tool installed on your operating system.
Here's an example of how to install with apt:
```
sudo apt-get install acpi
```