pt-pg-summary fails for Postgres12

STR:

1. Install PG 12
2. try to run pt-pg-summary
   Given result:

    [root@ip-10-178-0-119 ec2-user]# pt-pg-summary --username=postgres
   INFO[0000] Connecting to the database server using: user=postgres sslmode=disable dbname=postgres 
   INFO[0000] Connection OK                                
   FATA[0000] Cannot create a data collector instance: Cannot get databases list: sql: Scan error on column index 0: unsupported Scan, storing driver.Value type <nil> into type *models.Name 

Expected result: There is no errors, output looks like:

 [ec2-user@ip-10-178-2-48 ~]$ pt-pg-summary --username=postgres
INFO[0000] Connecting to the database server using: user=postgres sslmode=disable dbname=postgres 
INFO[0000] Connection OK                                
INFO[0000] Detected PostgreSQL version: 11.0.8          
INFO[0000] Getting global information                   
INFO[0000] Collecting global counters (1st pass)  .....
.......

pt-pg-summary for PG11 works ok

see  https://jira.percona.com/browse/PT-1868?focusedCommentId=260363&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-260363  for tech investigation