Fix examples

examples/embedded_linux_epd1in54/src/main.rs

@@ -7,7 +7,7 @@ extern crate eink_waveshare_rs;
 
 use eink_waveshare_rs::{
     EPD1in54, 
-    //drawing::{Graphics},
+    //drawing_old::{Graphics},
     color::Color,
     WaveshareDisplay,
 };

examples/embedded_linux_epd4in2/src/main.rs

@@ -7,7 +7,7 @@ extern crate eink_waveshare_rs;
 
 use eink_waveshare_rs::{
     EPD4in2, 
-    drawing::{Graphics},
+    drawing_old::{Graphics},
     color::Color, 
     WaveshareDisplay,
 };

examples/stm32f3discovery/src/main.rs

@@ -28,7 +28,7 @@ extern crate eink_waveshare_rs;
 use eink_waveshare_rs::{
     EPD1in54,
     SPI_MODE,
-    //drawing::{Graphics},
+    //drawing_old::{Graphics},
     color::Color,
     WaveshareDisplay,
 };

src/lib.rs

@@ -50,7 +50,9 @@ use hal::spi::{Mode, Phase, Polarity};
 #[cfg(feature = "graphics")]
 pub mod drawing;
 
-pub(crate) mod drawing_old;
+//TODO: remove old drawing support
+#[cfg(feature = "graphics")]
+pub mod drawing_old;
 
 mod traits;
 pub use traits::{WaveshareDisplay};