Update ceiling to round for correct results on multiples of 90 degree…

…s rotations

src/geometric_transformations.rs

@@ -336,8 +336,8 @@ where
     let cos = theta.cos();
     let sin = theta.sin();
 
-    let new_width = (height as f32 * sin.abs() + width as f32 * cos.abs()).ceil() as u32;
-    let new_height = (height as f32 * cos.abs() + width as f32 * sin.abs()).ceil() as u32;
+    let new_width = (height as f32 * sin.abs() + width as f32 * cos.abs()).round() as u32;
+    let new_height = (height as f32 * cos.abs() + width as f32 * sin.abs()).round() as u32;
 
     let mut out_img = Image::new(new_width, new_height);