CRAN version 0.7

New features:

• Supports most current Unpaywall data schema (from 20 Jan 2021), including improved detection of delayed OA | thanks @delwen and @Ahobert
• User-friendly interface to access all OA locations in a regular data frame.

Minor fixes:

• bug fix: emails with capital letter were rejected #28 | thanks @rkrug
• CI with GitHub actions
• improved docs