Bump version to v0.24.0

We need to bump 0.x.0 because the library API changed in incompatible
ways:

    $ cargo public-api diff
    Resolved `diff` to `diff 0.23.0`
    Removed items from the public API
    =================================
    (none)

    Changed items in the public API
    ===============================
    -pub fn bat::controller::Controller<'b>::run(&self, inputs: alloc::vec::Vec<bat::input::Input<'_>>) -> bat::error::Result<bool>
    +pub fn bat::controller::Controller<'b>::run(&self, inputs: alloc::vec::Vec<bat::input::Input<'_>>, output_buffer: core::option::Option<&mut dyn core::fmt::Write>) -> bat::error::Result<bool>
    -pub fn bat::controller::Controller<'b>::run_with_error_handler(&self, inputs: alloc::vec::Vec<bat::input::Input<'_>>, handle_error: impl core::ops::function::Fn(&bat::error::Error, &mut dyn std::io::Write)) -> bat::error::Result<bool>
    +pub fn bat::controller::Controller<'b>::run_with_error_handler(&self, inputs: alloc::vec::Vec<bat::input::Input<'_>>, output_buffer: core::option::Option<&mut dyn core::fmt::Write>, handle_error: impl core::ops::function::Fn(&bat::error::Error, &mut dyn std::io::Write)) -> bat::error::Result<bool>

    Added items to the public API
    =============================
    [...]

Update man page regarding --nonprintable-notation

Bump version to v0.22.1

Update binary assets

assets/create.sh

Prepare for v0.20.0 release

Since we have added new enum variants to the `StyleComponent` which was
not previously marked `#[non_exhaustive]`, we must bump left-most
non-zero version number (see
[specifying-dependencies](https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#specifying-dependencies-from-cratesio)).
Otherwise client code that do exhaustive matches on `StyleComponent`
will stop compiling.

Run `assets/create.sh`

Bump version to v0.18.3

Add note on vulnerability reporting, closes sharkdp#1473

Merge pull request sharkdp#1649 from sharkdp/v0.18.1

bat 0.18.1