Requests cache will be required by requests-based document loader
Requests cache will be required by requests-based document loader

- add requests_cache package to the requirements.txt

concentricsky/badgecheck,IMSGlobal/openbadges-validator-core,openbadges/badgecheck,IMSGlobal/openbadges-validator-core,openbadges/badgecheck,concentricsky/badgecheck