# CHANGELOG

## [1.0.0] - 2026-02-13
### Added
- Initial public release of diffstep
- Expression validation and normalization
- Tokenization engine
- AST parser
- Symbolic differentiation
- AST to string printer
- Expression simplification

## [1.1.0] - 2026-03-02
### Added
- New lowercase `diffstep()` public API function

### Deprecated
- `DiffStep()` function is now deprecated and will be removed in a future major version
- Users should migrate to `diffstep()`

### Internal
- Improved API consistency (PEP8 naming conventions)