v0.4.0

### Gum Themes!

You can now configure Gum to use default styling for different commands with `$ENVIRONMENT_VARIABLES`. Gum will use this configuration by default (`--flags` can override these settings):

For example, `gum filter` can be customized with the following:

```bash
export GUM_FILTER_INDICATOR="*"
export GUM_FILTER_INDICATOR_FOREGROUND=1
export GUM_FILTER_PROMPT="→"
export GUM_FILTER_PROMPT_FOREGROUND=1

# command will now use default customization from the environment variables but
# can still be overridden by flags.
gum filter
```

#### New Features
* `--char-limit` flag is now available on `gum write` and `gum input` to limit the number of characters typed into the inputs.

#### Bug Fixes
* Fix readability on light theme for `gum confirm`
* `gum style --help` now lists all flags available
* `gum filter` uses alternative screen buffer if no `--height` is specified to preserve screen history when it exits (with `--height` flag it runs inline)

**Full Changelog**: https://github.com/charmbracelet/gum/compare/v0.3.0...v0.4.0

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