Update tui requirement from 0.15 to 0.19

[dependabot[bot]]

Updates the requirements on tui to permit the latest version.

Release notes

Sourced from tui's releases.

v0.19.0

Features

• Bump crossterm to 0.25

Changelog

Sourced from tui's changelog.

v0.19.0 - 2022-08-14

Features

• Bump crossterm to 0.25

v0.18.0 - 2022-04-24

Features

• Update crossterm to 0.23

v0.17.0 - 2022-01-22

Features

• Add option to widgets::List to repeat the hightlight symbol for each line of multi-line items (#533).
• Add option to control the alignment of Axis labels in the Chart widget (#568).

Breaking changes

• The minimum supported rust version is now 1.56.1.

New default backend and consolidated backend options (#553)

• crossterm is now the default backend. If you are already using the crossterm backend, you can simplify your dependency specification in Cargo.toml:

- tui = { version = "0.16", default-features = false, features = ["crossterm"] }
+ tui = "0.17"

If you are using the termion backend, your Cargo is now a bit more verbose:

- tui = "0.16"
+ tui = { version = "0.17", default-features = false, features = ["termion"] }

crossterm has also been bumped to version 0.22.

Because of their apparent low usage, curses and rustbox backends have been removed. If you are using one of them, you can import their last implementation in your own project:

• curses
• rustbox

Canvas labels (#543)

• Labels of the Canvas widget are now text::Spans. The signature of widgets::canvas::Context::print has thus been updated:

- ctx.print(x, y, "Some text", Color::Yellow);
</tr></table> 

... (truncated)

Commits

• a05fd45 Release v0.19.0
• 24de2f8 chore: bump crossterm to v0.25
• eee3701 chore: fix clippy warnings
• a67706b chore(ci): bump cargo-make to v0.35.16
• faa69b6 chore: explicitly set MSRV to 1.56.1 in Cargo.toml
• ba5ea2d chore: update README
• a6b25a4 chore: add panic hook example (#593)
• 90d8cb6 chore: add more apps using tui to the README
• e71faa9 Release v0.18.0
• ed0ae81 chore: update crossterm to v0.23 (#598)
• Additional commits viewable in compare view

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