Add failed code blocks to readline history.
Add failed code blocks to readline history.

Fixes #32
adetch/psysh,damiankloip/psysh,bobthecow/psysh,mubassirhayat/psysh,adetch/psysh,barryvdh/psysh,barryvdh/psysh,mubassirhayat/psysh,bobthecow/psysh,lvht/psysh,damiankloip/psysh,damiankloip/psysh,lvht/psysh