Slack Send v1.16.0

• Added support for Incoming Webhooks (#12) - Thanks @m5kr1pka
• Enable passing JSON payload to Slack App Route (#22) - Thanks @thatrandybrown
• Upgrade all dependencies to latest versions (#19) - Thanks @ddzz
• Adding automated build & tag update on release (#23) - Thanks @robzr
• Many Readme updates - Thanks @desrosj, @rabotyaga, @lulzneko, @cageyv, @seratch, @jonboulle

Slack Send 1.15.0

This is the first public release of the new Slack Send GitHub Action!

This action supports sending messages to channels and also sending JSON data to the Slack Workflow Builder.