added documentation for converting to RGBA png type (which is supported)

README.md

@@ -1,3 +1,5 @@
 # cowmic
 
 generates memes
+
+`mogrify -define png:format=png32 -format png *.png`

cowgen/src/lib.rs

@@ -9,7 +9,7 @@ pub struct Template<T: AsRef<str>, V: AsRef<Path>> {
 
 impl<T: AsRef<str>, V: AsRef<Path>> Template<T, V> {
     pub fn new(base: Vec<u8>, elements: Vec<Element<T, V>>) -> Result<Self, CowError> {
-        let base: Image = Image::from_bytes_inferred(base)?;
+        let base: Image<Dynamic> = Image::from_bytes_inferred(base)?;
         Ok(Self {
             dimensions: base.dimensions(),
             elements,

cowmic/src/main.rs

@@ -4,7 +4,7 @@ use cowgen::{CowError, Element, Text};
 
 fn main() -> Result<(), CowError> {
     let out = cowgen::Template::new(
-        include_bytes!("cow.png").to_vec(),
+        include_bytes!("cow2.png").to_vec(),
         vec![Element::new(
             cowgen::Media::Text(Text::new(
                 "Hello",