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
    =============================
    [...]

CHANGELOG.md

@@ -1,4 +1,4 @@
-# unreleased
+# v0.24.0
 
 ## Features
 
@@ -36,8 +36,6 @@
 - add `NSIS` support, see #2577 (@idleberg)
 - Update `ssh-config`, see #2697 (@mrmeszaros)
 
-## Themes
-
 ## `bat` as a library
 
 - Add optional output_buffer arg to `Controller::run()` and `Controller::run_with_error_handler()`, see #2618 (@Piturnah)

Cargo.toml

@@ -6,7 +6,7 @@ homepage = "https://github.com/sharkdp/bat"
 license = "MIT OR Apache-2.0"
 name = "bat"
 repository = "https://github.com/sharkdp/bat"
-version = "0.23.0"
+version = "0.24.0"
 exclude = ["assets/syntaxes/*", "assets/themes/*"]
 build = "build.rs"
 edition = '2018'