add link to email (#27)
add link to email (#27)

Signed-off-by: Doug Davis <ff3bde741799c0eff815b83a54eda3fc494df54f@us.ibm.com>

Co-authored-by: Dustin Ingram <f502e82c25bba5a06cf68ffa87ecd02371c1a975@users.noreply.github.com>
cloudevents/sdk-python