Currently, the database is checked against the latest version of the echemdb metadata schema before building it. It would be great if the version of the metadata schema is fixed between certain values such as `>=0.2.0,<0.3.0` - [ ] Include current version of the meta data schema on the main page (as a tag including a link to the schema). - [ ] Version should be included in the output datapackages. - [ ] define which version should be used to check the db against. - [ ] A bot should verify if a new version exists and create a pull request.