CHANGELOG.md from GCSBOSS/periodo

CHANGELOG.md

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# Periodo Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [v0.1.1] - 2019-09-16

### Added
- function to add and subtract periods from dates

## [v0.1.0] - 2019-09-13
- First officially published version.

[v0.1.0]: https://gitlab.com/GCSBOSS/periodo/-/tags/v0.1.0
[v0.1.1]: https://gitlab.com/GCSBOSS/periodo/-/tags/v0.1.1