readme cleanup

README.md

@@ -4,9 +4,14 @@
 
 # edges
 
-get the edges of objects in images with transparency
+get the edges of objects in images with transparency.
 
-# using
+## supported image types
+
+- `image::DynamicImage`
+- `bevy::render::texture::Image` (or if you rather, `bevy::prelude::Image`)
+
+## using
 
 ```rust
 use edges::Edges;
@@ -34,10 +39,6 @@ after that, we need to put the coordinates in some kind of "drawing order" so wh
 crate collects all pixels, in order, that are a distance of 1 from eachother. if there are pixels that have a distance greater than 1
 from any pixel in an existing group, that pixel begins a new group.
 
-## maybe todo?
-
-- allow input for specifying the pixel value you want to treat as "transparency"
-
 ## license
 
 all code in this repository is dual-licensed under either: