fix(docs): add derives to Point example so Haskell output is accurate

Author: markovejnovic

hsrs/src/lib.rs

@@ -8,6 +8,7 @@
 //! # Example
 //!
 //! ```rust,ignore
+//! #[derive(Debug, PartialEq)]
 //! #[hsrs::value_type]
 //! pub struct Point {
 //!     pub x: i32,