Does not compile for feature "heltec"

[woidbaier]

I have tried compiling with the heltec feature, but it always fails:

woidbaier@test22:~/Desktop//rust-esp32-std-demo$` cargo build --features heltec
      Updating crates.io index
   Compiling compiler_builtins v0.1.82
   [...]
   Compiling mipidsi v0.5.0
error[E0277]: the trait bound `BinaryColor: embedded_graphics::prelude::RgbColor` is not satisfied
    --> src/main.rs:926:14
     |
926  |     led_draw(&mut display).map_err(|e| anyhow::anyhow!("Display error: {:?}", e))?;
     |     -------- ^^^^^^^^^^^^ the trait `embedded_graphics::prelude::RgbColor` is not implemented for `BinaryColor`
     |     |
     |     required by a bound introduced by this call
     |
     = help: the following other types implement trait `embedded_graphics::prelude::RgbColor`:
               Bgr555
               Bgr565
               Bgr666
               Bgr888
               Rgb555
               Rgb565
               Rgb666
               Rgb888
note: required by a bound in `led_draw`
    --> src/main.rs:1080:15
     |
1077 | fn led_draw<D>(display: &mut D) -> Result<(), D::Error>
     |    -------- required by a bound in this
...
1080 |     D::Color: RgbColor,
     |               ^^^^^^^^ required by this bound in `led_draw`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `rust-esp32-std-demo` due to previous error

[ivmarkov]

Fixed.