fix(fs): add missing std::error::Error impl for fs::Error

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "kxio"
-version = "1.1.0"
+version = "1.1.1"
 edition = "2021"
 authors = ["Paul Campbell <pcampbell@kemitix.net>"]
 description = "Provides injectable Filesystem and Network resources to make code more testable"

src/fs/mod.rs

@@ -18,6 +18,8 @@ pub enum Error {
         path: PathBuf,
     },
 }
+impl std::error::Error for Error {}
+
 pub type Result<T> = core::result::Result<T, Error>;
 
 pub const fn new(base: PathBuf) -> FileSystem {