Log Message:
Update to 1.60

Upstream changes:
1.60 - 2019-05-29
 * No changes since 1.59_01

1.59_01 - 2019-04-28
 * Add support for parsing PostgreSQL dollar-quoted strings
 * Add support for materialized views in Oracle producer
 * switched JSON backend from JSON.pm to JSON::MaybeXS
 * Port Makefile.PL from Module::Install to Distar
 * Synchronise the version number across all modules