v0.4.0

Breaking Changes

Multiple changes to the CustomType prompt:

• Added support for validators, separating concerns between parsing and validating parsed values.
• Decoupled default value formatting from the default value property. Now you can set default values without a specific formatter to accompany them.
• Input is not cleared anymore when the parsing or validation fails.

New autocompletion mechanism for Text prompts

• Existing methods still work, you just have to update with_suggester calls to with_autocomplete.
• To know more about the new possibilities, check the updated documentation on the repository's README.

Other changes

• Added shorthand method rgb(r: u8, g: u8, b: u8) to create a Color struct from RGB components. Thanks to @tpoliaw for the PR! #73