Pysyncon

What's Changed
* A class `LinearFactorModel` was added that can generate data following a Linear factor model for testing/illustration/etc. purposes by sdfordham in https://github.com/sdfordham/pysyncon/pull/51
* A `ConformalInference` class was added that can compute confidence intervals following Chernozhukov et al. A confidence interval method was added to the `Synth` class that can generate confidence intervals using this class by sdfordham in https://github.com/sdfordham/pysyncon/pull/56


**Full Changelog**: https://github.com/sdfordham/pysyncon/compare/v1.4.0...v1.5.0

What's Changed
* Added metric methods (APE, MAPE, MAE) to quantify the goodness of fit with the treated unit by sdfordham in https://github.com/sdfordham/pysyncon/pull/45
* Now allow more statistical operations (sum, count, maximum, minimum, variance) on predictors (`predictors_op` argument of `Dataprep`) by sdfordham in https://github.com/sdfordham/pysyncon/pull/46


**Full Changelog**: https://github.com/sdfordham/pysyncon/compare/v1.3.0...v1.4.0

What's Changed
* The implementation of `PenalizedSynth` was flawed and has now been fixed so that it is faithful to the original paper (ref 31), by sdfordham in https://github.com/sdfordham/pysyncon/pull/42


**Full Changelog**: https://github.com/sdfordham/pysyncon/compare/v1.2.0...v1.3.0

What's Changed
* Added `att` method to synthetic control methods that returns the average treatment effect on the treated unit over a given time period by sdfordham in https://github.com/sdfordham/pysyncon/pull/32
* Dataprep string representation added by sdfordham in https://github.com/sdfordham/pysyncon/pull/34
* Small speed ups in numpy array creations by sdfordham in https://github.com/sdfordham/pysyncon/pull/36


**Full Changelog**: https://github.com/sdfordham/pysyncon/compare/v1.1.0...v1.2.0

- Required packages no longer have their versions pinned.
- Documentation has been improved drastically.

- Unpin the install requirements
- Improve the documentation