doc: add changelog

Closes #2

See merge request to-be-continuous/gcloud!2

Signed-off-by: Cédric OLIVIER <cedric3.olivier@orange.com>

# [1.4.0](https://gitlab.com/to-be-continuous/gcloud/compare/1.3.0...1.4.0) (2021-09-03)

### Features

* Change boolean variable behaviour ([469f03f5](https://gitlab.com/to-be-continuous/gcloud/commit/469f03f5596b0072a322e04bd5d9fa412ce57d75))

feat: Change boolean variable behaviour

Closes #1

See merge request to-be-continuous/gcloud!1

Signed-off-by: Cédric OLIVIER <cedric3.olivier@orange.com>

# [1.3.0](https://gitlab.com/to-be-continuous/gcloud/compare/1.2.0...1.3.0) (2021-06-19)

### Features

* support multi-lines environment variables substitution ([88dd89ad](https://gitlab.com/to-be-continuous/gcloud/commit/88dd89ad5514eb56032093edc5cb81bdfb51df80))

# [1.2.0](https://gitlab.com/to-be-continuous/gcloud/compare/1.1.0...1.2.0) (2021-06-10)

### Features

* move group ([6ae08871](https://gitlab.com/to-be-continuous/gcloud/commit/6ae088718ba0a22887b3ebe19563c1f9d243823e))

# [1.1.0](https://gitlab.com/Orange-OpenSource/tbc/gcloud/compare/1.0.0...1.1.0) (2021-05-18)

### Features

* add scoped variables support ([5a598570](https://gitlab.com/Orange-OpenSource/tbc/gcloud/commit/5a598570fd58469b2d8b4020cf1e832aabe602e6))