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* Allow FnMut for validate

This allows mutable closures for validation, allowing stateful
validators.

This breaks BC. Input::interact*() now take &mut self instead of &self.
However, this shall not break most usres,
since (I think) users usually use Input in chained syntax
or call one of the &mut methods (like with_prompt) separately,
which would require a `let mut` anyway.

* Added example case with stateful validator

* Updated CHANGELOG.md

* Revert version bump

Fix typo: ereased -> erased

* Add interact_opt Confirm example

* Execute private _interact_on fn

Makes `Confirm::interact_on` call private fn `Confirm::_interact_on`,
which will allow for optionally allowing the user to quit.

* Read key instead of char

Allows handling of escape key

* Change return type to Result<Option<bool>>

Changes the return type of `Confirm::_interact_on`, and handles the
rendered answer when it is `None`.

* Handle quitting Confirm in private fn

* Add optional interactions for Confirm

Allows the user to answer neither "yes" nor "no"

* Make exit clear confirm when waiting for newline

* Display cancel instead of n/a

* Set example confirm default to yes

Sets the default value to "yes" for the optional confirm that waits for a newline,
to simplify viewing behavior of a "quit" input when waiting for newline.

Per discussion in #101

* Only set None value to default if quit forbidden

Prevents the value of confirm prompt from being converted to the default
value when no value selected *only if* returning a None value is
allowed.

* Show no selected value when it is None

Removes the "cancel" output from an optional confirm.

Per discussion in #101

dialoguer@0.8.0

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