feat: support slack notifications (#4)

* feat: add slack notification support

* fix: add node-fetch

* fix: correct markdown

* fix: push dist files

* feat: add support to project url and production hook

* feat: ignore rc tags on changelog

* fix: replace only list at begin of line by arrows

Author: henrycunh

action.yml

@@ -17,6 +17,15 @@ inputs:
         required: false
         description: Determines if the release is a release candidate
         default: 'true'
+    slack-webhook-url:
+        required: false
+        description: A webhook URL of a Slack channel that if provided, will notify the release
+    project-url:
+        required: false
+        description: A URL of the project that will be used in the slack notification
+    production-action-url:
+        required: false
+        description: A URL of the production deployment action that will be used in the slack notification
 outputs:
     next-version:
         description: Next version to be released