* Support for multiple domains within --domain-filter
The parameter accepts a comma separated list of domains with or without trailing dot. Example: --domain-filter="example.org, company.test.,staging.com". Closes#247 and #229
* Add boilerplate header
* Add documentation for methods and structs
* use StringsVar for the domain-filter flag
* go fmt
* Remove camel case from tests
* Revert changes in README.md
* Move DomainFilter to provider package
* Make a new slice and copy elements to it
* Update CHANGELOG.md
* docs: change minor spelling mistake
* adjust docs before the v0.3.0 release
* minor fixes
* docs: add missing dot
* docs: add missing dot
* docs: drop line
* docs: drop another line
* adjust documentation
* update main readme
* checkbox for releases, add --txt-owner-id flag in description
* docs: minor weird character fixes [ci skip]