Bump subprocess and toml. Also remove the demo project I accidentally

pushed.

crates/core/src/error.rs

@@ -5,16 +5,13 @@ pub type Result<T> = std::result::Result<T, Error>;
 #[derive(Debug, From, Display)]
 pub enum Error {
     #[from]
-    Io(io::Error),
+    Io(std::io::Error),
 
     #[from]
     Java(java::Error),
 
     MissingFileName,
 
-    #[from]
-    StdIo(std::io::Error),
-
     #[from]
     TomlDeserialize(toml::de::Error),