Version 0.9.8

FIX poor performance while fetching annopage Info
Update caching 
Fix Cronjob

Jira release: https://europeana.atlassian.net/projects/EA/versions/11245/tab/release-report-all-issues

What's Changed

• EA-3994 fix poor performance by @SrishtiSingh-eu in #139
• EA-4019 review and update caching by @SrishtiSingh-eu in #141
• EA-4040 Fix cronjob by @nshweta90 in #140

Full Changelog: https://github.com/europeana/fulltext-api/compare/fulltext-0.9.7...fulltext-0.9.8?expand=1