Add documentation to readme-facebook about notification_type field
Add documentation to readme-facebook about notification_type field
howdyai/botkit,acrollet/botkit,howdyai/botkit,DJ1K1/botkit,healthchatnow/hcn,samuelsan/YelpBot,howdyai/botkit,EliKrumholz/botkit,ouadie-lahdioui/botkit,DJ1K1/botkit,dhulser/slack-reporting-bot,howdyai/botkit