allow level= to be set at report_exc_info (can override via payload)
test for level in report_exc_info (verify payload_data override)
Merge branch 'heyinc-set-level-report-exc-info'
update changelog, up version, and add @jamesonjlee to THANKS
no need to copy the initial dict since we can safely merge everything into it. This also fixes the problem where some local variables cannot be deepcopy()'d but can be JSON serialized. @sbezboro