What's Changed
* `copy` method by hanjinliu in https://github.com/hanjinliu/whitecanvas/pull/64
* Minor ticks in matplotlib backend by hanjinliu in https://github.com/hanjinliu/whitecanvas/pull/65
* Deep copy layers by hanjinliu in https://github.com/hanjinliu/whitecanvas/pull/66
* fix axis lims by hanjinliu in https://github.com/hanjinliu/whitecanvas/pull/67
**Full Changelog**: https://github.com/hanjinliu/whitecanvas/compare/v0.3.2...v0.3.3