connect-pg-simple 7.0.0 on Node.js NPM

Breaking change: Now requires at least Node.js 12.x
Possibly breaking change: Align session expiration logic with connect-redis which in turned aligned with connect-mongo. Fixes #54.
Minor breaking change: The .close() method is now async and returns a Promise that will be resolved when this session store is fully shut down. Fixes #183.
Feature: New option: disableTouch. Disables updating of TTL in database on touch. Fixes #55.
Feature: New option: createTableIfMissing. When set, the session table will be automatically created if missing. Fixes #158 and #173. Thanks @aadeshmisra!
Tweak: Slightly tweaked the pg-promise integration. Fixes #153.
Tweak: Introduced a new internal _asyncQuery() function in a move to modernize internal code on top of Promise / async / await.