Traval

What's Changed
* Some improvements to detection rules by dbrakenhoff in https://github.com/ArtesiaWater/traval/pull/9


**Full Changelog**: https://github.com/ArtesiaWater/traval/compare/v0.3.1...v0.4.0

**Full Changelog**: https://github.com/ArtesiaWater/traval/compare/v0.3.0...v0.3.1

Summary:
- add option `min_ci` for minimum bandwidth width in `rule_pastas_outside_pi`
- add option `smoothfreq` for time shifting bounds and then recalculating min/max bounds for dealing with steep gradients in heads

**Full Changelog**: https://github.com/ArtesiaWater/traval/compare/v0.2.1...v0.3.0

Minor fix for checking dtype of input series

Add TravalParameters object for managing and storing parameters for error detection algorithms defined by RuleSet.

First official release!