NatLibFi/Annif-client: Annif-client v0.4

What's Changed Update CI/CD pipeline in https://github.com/NatLibFi/Annif-client/pull/8 Fix 405 response from suggest requests in https://github.com/NatLibFi/Annif-client/pull/7 Remove learn method demo in https://github.com/NatLibFi/Annif-client/pull/9 Add method for fetching info of API and demo it in https://github.com/NatLibFi/Annif-client/pull/10 Add suggest-batch method and demo it in https://github.com/NatLibFi/Annif-client/pull/11 Use tailored user-agent in requests to API in https://github.com/NatLibFi/Annif-client/pull/12 Full Changelog: https://github.com/NatLibFi/Annif-client/compare/v0.3.1...v0.4.