Update to rust 2021

Fix tests

Cargo.toml

@@ -2,7 +2,7 @@
 name = "image-api"
 version = "0.1.0"
 authors = ["Cameron Cordes <cameronc.dev@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

src/files.rs

@@ -396,7 +396,7 @@ mod tests {
         }
 
         fn move_file<P: AsRef<Path>>(&self, from: P, destination: P) -> anyhow::Result<()> {
-
+            todo!()
         }
     }