Replace form href with action in README

Change-Id: Ib7ae22bd9d65d259751889d7064b637a90452787
Reviewed-on: https://gerrit.causes.com/23211
Reviewed-by: Preston Guillory <preston.guillory@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Tested-by: Joe Lencioni <joe.lencioni@causes.com>