Include changelog file

Author: alvarolopez

CHANGELOG.md

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+# 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).
+
+## [Unreleased]
+### Added
+### Changed
+- Start using a changelog.
+
+### Deprecated
+### Removed
+### Fixed
+- Updated documentation.
+
+### Security
+
+## [1.3.0] - 2020-04-22
+### Added
+- New `deepaas-cli` command line tool.
+
+### Changed
+- Decoupled API from ModelWrapper class.
+
+## [1.2.1] - 2020-03-06
+### Changed
+- Include original filename in UploadedFile objects.
+
+### Fixed
+- Fix GPU OOM, not using anymore separated train and predict pools (#87).
+
+## [1.2.0] - 2020-03-02
+### Added
+- Add deepaas-execute command.
+
+### Changed
+- Pin webargs version <6.0.0 (#82).
+- OpenWhisk: set debug as specified by user.
+- OpenWhisk: set client_max_size also on OpenWhisk proxy.
+- Improved documentation.
+
+### Fixed
+- Fixed unit tests.
+
+## [1.1.1] - 2020-02-19
+### Fixed
+- Use `spawn` method rather than `fork` for the training process pool.
+
+## [1.1.0] - 2020-02-18
+### Changed
+- Remove vendorized aiohttp-apispec.
+- Include `training_args`, `training_output` and `training_duration` to the `train_response`.
+
+### Fixed
+- Fixed unit tests.
+
+## [1.0.1] - 2020-02-10
+### Changed
+- Vendorize aiohttp-apispec.
+
+### Fixed
+- Correctly handle swagger links (UI and spec file).
+- Fixed unit tests.
+- Fix cancellation of trainings.
+- Update documentation.
+
+## [1.0.0] - 2020-01-21
+### Changed
+- Drop Flask in favour of aiohttp. This large patchet drops Flask and
+  Flask-RESTPlus in favour of aiohttp, aiohttp-apispec, marshmallow and webargs
+  in order to implement asyncrhonous requests. We still maintain v1, alhtough
+  marked as depreated.
+
+### Added
+- New API (V2) and new model wrappers (v2) are introduced.
+
+### Deprecated
+- API V1 is marked as deprecated and staged for removel in the next release.
+
+## [0.5.2] - 2020-09-05
+### Fixed
+- Fix documentation build error.
+
+## [0.5.1] - 2019-08-23
+### Fixed
+- Fix test arguments and parser, in order to be consistent with the previous
+  version of DEEPaaS, in which we returned a list of len 1 (because of the
+  Swagger bug) for the args['files'] parameter in the predict_data method.
+
+
+## [0.5.0] - 2019-07-23
+### Changed
+Improve unit testing.
+Improve documentation.
+
+### Fixed
+Fix dependency on gevent.
+
+## [0.4.1] - 2019-07-17
+### Changed
+Updated Dockerfile.
+
+## [0.4.0] - 2019-06-06
+### Added
+Add initial version of paper for Journal of Open Source Software.
+
+### Fixed
+Handle SIGTERM signal explicitly for better Docker execution.
+Improve CI/CD integration
+
+## [0.3.0] - 2019-02-20
+### Added
+Add support to run DEEPaaS as an OpenWhisk Docker action.
+
+### Changed
+Update documentation.
+
+## [0.2.0] - 2019-01-14
+### Added
+- Initial support for passing down training arguments to underlying models.
+  This version implements the loading of arguments for each model. Since
+  different models would have different arguments, we need to pre-populate the
+  API with those routes.
+
+## [0.1.2] - 2018-12-04
+### Fixed
+- Fix PyPi classifiers.
+- Fix documentation automated generation.
+
+## [0.1.1] - 2018-12-04
+### Added
+- Initial documentation.
+
+### Fixed
+- Testing and CI/CD improvements.
+
+## [0.1.0] - 2018-10-26
+### Changed
+- Initial release.