What's Changed
* Reorganize modeling folder by mtth in https://github.com/opvious/sdk.py/pull/114
* Simplify fragment implementations by mtth in https://github.com/opvious/sdk.py/pull/115
* Allow negating activation variables by mtth in https://github.com/opvious/sdk.py/pull/116
**Full Changelog**: https://github.com/opvious/sdk.py/compare/v0.18.1...v0.18.2rc2