* impl Hash and Eq for Expression for use in deduplication. (25) ([8bcd8bd](https://github.com/rigetti/quil-rust/commit/8bcd8bd473115681756f0bb7bebeb4f43a47127a)), closes [#25](https://github.com/rigetti/quil-rust/issues/25)
0.5.5rc.0
Features
- Make in-place addition of Program more efficient (290)