Fix typo calling old_expecption_handler instead of old_error_handler
Fix typo calling old_expecption_handler instead of old_error_handler

mfn/raven-php,cpascal/raven-php,ste93cry/sentry-php,hautelook/sentry-client,nokitakaze/sentry-php,ruudk/sentry-client,patrick91/raven-php,getsentry/sentry-php,theand/raven-php,madssj/raven-php,ManhattanPrep/raven-php,getsentry/raven-php,getsentry/sentry-php