Use of unstable library

[Julien-cpsn]

Hello,

Firstly, thank you for this library, it's great!
Secondly, I could not compile on various machines due to unstable library. Since the "unstable" part only consists of 2 functions, are you able to get rid of them and go back in a more "stable" library? That would be fantastic :)

Here is the cargo trace:

error[E0658]: use of unstable library feature 'int_roundings'
  --> C:\Users\mmm\.cargo\registry\src\index.crates.io-6f17d22bba15001f\tui-big-text-0.4.1\src\big_text.rs:93:23
   |
93 |     let width = 8_u16.div_ceil(step_x);
   |                       ^^^^^^^^
   |
   = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information

error[E0658]: use of unstable library feature 'int_roundings'
  --> C:\Users\mmm\.cargo\registry\src\index.crates.io-6f17d22bba15001f\tui-big-text-0.4.1\src\big_text.rs:94:24
   |
94 |     let height = 8_u16.div_ceil(step_y);
   |                        ^^^^^^^^
   |
   = note: see issue #88581 <https://github.com/rust-lang/rust/issues/88581> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `tui-big-text` (lib) due to 2 previous errors

Linked issue: rust-lang/rust#88581

Have a great day

[Julien-cpsn]

Updating rustup have solved the issue since the stable version was merged into the stablechannel