[typo] typo in certdir/README.md (#2309)
[typo] typo in certdir/README.md (#2309)

certificatess => certificates
pgjdbc/pgjdbc,jorsol/pgjdbc,pgjdbc/pgjdbc,jorsol/pgjdbc,jorsol/pgjdbc,pgjdbc/pgjdbc,marschall/pgjdbc,pgjdbc/pgjdbc,marschall/pgjdbc,marschall/pgjdbc,jorsol/pgjdbc,marschall/pgjdbc