Add 0.4.2 changelog
Add 0.4.2 changelog

healthchatnow/hcn,howdyai/botkit,samuelsan/YelpBot,dhulser/slack-reporting-bot,howdyai/botkit,acrollet/botkit,ouadie-lahdioui/botkit,EliKrumholz/botkit,howdyai/botkit,DJ1K1/botkit,DJ1K1/botkit,howdyai/botkit