Add slack_application_url support to slack:starting task
Add slack_application_url support to slack:starting task

SiftScience/capistrano-slack,ZenPayroll/capistrano-slack,Bridj/capistrano-slack,10Kft/capistrano-slack,j-mcnally/capistrano-slack,windhorn/capistrano-slack,Gusto/capistrano-slack