wal2json 2.3

Notable changes in this release include:

• add parameter include-domain-data-type (replace domain name with its underlying data type)
• add support for Postgres 13
• add parameter filter-origins (filter out changes from replication origins)
• improve installation and configuration instructions
• fix an oversight for old minor versions
• add parameter include-column-positions (include pg_attribute.attnum)
• add parameter include-default (column default expression)
• add parameter include-pk (primary key)
• fix oversight in format 2: add nextlsn

Thanks to all users that who reported bugs and feature requests.