SOMEF 0.9.8: Improving CodeMeta export

This release of somef improves significantly the errors on the CodeMeta export, updating the support to v3.0

What's Changed

• Resolve issue when wiki without content. Fixes #697 by @juanjemdIos in #701
• Several changes about referencePublication, citation, scholarlyArticle. Fixes #640, #685 by @juanjemdIos in #703
• Title without content and spdx id for licenses. Fixes #700, #679 by @juanjemdIos in #706
• Normalization of citations (CFF, Bib). Fixes #629 by @juanjemdIos in #708
• Improve codemeta export. Fixes #678 by @juanjemdIos in #710
• spdx_id must be identifier in license. by @juanjemdIos in #715
• fix in codeMeta ns by @dgarijo in #717

Full Changelog: 0.9.7...0.9.8