Update version to v0.6.0

Update version to v0.5.1

Update version to v0.5.0

Update version to v0.4.0

Refactoring http request (#26)

* Reactoring HTTP request
* Remove useless methods and tests related to Request
* Add methods for type Task and update tests
* Other slight changes

Update version to v0.3.0

Update version to v0.2.0

Update go version and add tools for dev (#17)

* Update golang version to 1.20 
* Add Makefile
* Add config for github actions 
* Replace package io/ioutil to os
* Change messages of errors by using the beginning of lower-case letter