use prelude in examples

examples/embedded_linux_epd1in54/src/main.rs

@@ -11,8 +11,7 @@ use eink_waveshare_rs::{
         Buffer1in54,
     },
     graphics::{Display, DisplayRotation},
-    color::Color,
+    prelude::*,
-    WaveshareDisplay,
 };
 
 use lin_hal::spidev::{self, SpidevOptions};

examples/embedded_linux_epd4in2/src/main.rs

@@ -11,8 +11,7 @@ use eink_waveshare_rs::{
         Buffer4in2,
     },
     graphics::{Display, DisplayRotation},
-    color::Color, 
+    prelude::*,
-    WaveshareDisplay,
 };
 
 extern crate embedded_graphics;