<!--- Describe your changes in detail --><!--- Link to any relevant issues --><!--- You can drag image files into GitHub's edit-window for any screenshots -->##Checks<!--- Go over all the following points, and put an `x` in all the boxes that apply. --><!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->-[ ] I have updated `CHANGES.md`, with [BREAKING] next to all breaking changes
- [ ] I have updated the documentation if necessary
- [ ] If 01_square example was changed, `src/lib.rs` and `README.md` were updated