[bug] mailto parameter when calling CrossRef

[smierz]

There are two issues with getting into the polite pool of CrossRef:

• the mailto parameter is currently never set. since get_crossref is basically a private method, the parameter would have to be added to every public method (e.g. journal_search, fetch_paper_page). could be improved by making it an object where the parameter is set once at creation.
• the contact parameter for get_crossref has the wrong type (-> Config). If you would hand over your config to the method the mailto parameter would be something like db=PosixPath('db.sqlite') log_dir=PosixPath('logs') host='localhost' port=8000 env='dev' crossref_email=None public_url='http://localhost'

[sneakers-the-rat]

oop you're very right, missed that - had already made the config parameter and everything.

config is sourced from a .env file or environment variables, have documenting how that works on the checklist!

https://github.com/sneakers-the-rat/paper-feeds/pull/30