Fix __HALT_COMPILER so Phar doesn’t complain.
Fix __HALT_COMPILER so Phar doesn’t complain.

Fixes #62
barryvdh/psysh,lvht/psysh,damiankloip/psysh,bobthecow/psysh,barryvdh/psysh,mubassirhayat/psysh,adetch/psysh,damiankloip/psysh,adetch/psysh,lvht/psysh,damiankloip/psysh,bobthecow/psysh,mubassirhayat/psysh