Updated `AUTHORS.rst`
Updated `AUTHORS.rst`

Added @jwhitlock, and @jpulec to the authors file.
Thanks both of you!

emergence/django-simple-history,luzfcb/django-simple-history,luzfcb/django-simple-history,pombredanne/django-simple-history,pombredanne/django-simple-history,treyhunner/django-simple-history,emergence/django-simple-history,treyhunner/django-simple-history