Suggest PDO SQLite extension for the doc command.
Suggest PDO SQLite extension for the doc command.

Fixes #160
damiankloip/psysh,damiankloip/psysh,bobthecow/psysh,bobthecow/psysh,adetch/psysh,mubassirhayat/psysh,lvht/psysh,damiankloip/psysh,adetch/psysh,mubassirhayat/psysh,lvht/psysh