Trigger release on published (#199)

`created` event is not emitted when a draft release is published, while `published` event is always emitted with or without a draft release.

Author: savingoyal

.github/workflows/publish.yml

@@ -1,7 +1,7 @@
 name: Publish
 on:
   release:
-    types: [created]
+    types: [published]
 jobs:
   test:
     name: Test on ${{ matrix.os }}