Update README.md with Jdk 11 and md fixes
Update README.md with Jdk 11 and md fixes

Change-Id: Iff4bc642e1b7fd09ddb9681021284ffe9c318da5
Reviewed-on: https://korap.ids-mannheim.de/gerrit/c/KorAP/Koral/+/6289
Reviewed-by: Nils Diewald <ad3fa8d847df2b57853a376ad688e4be8041ecd4@diewald-online.de>

KorAP/Koral