Add draft release support (fixes #19)

README.md

@@ -18,6 +18,7 @@ Optional Arguments
 - `file_glob`: If set to true, the `file` argument can be a glob pattern (`asset_name` is ignored in this case) (Default: `false`)
 - `overwrite`: If an asset with the same name already exists, overwrite it (Default: `false`).
 - `promote`: If a prerelease already exists, promote it to a release (Default: `false`).
+- `draft`: Sets the release as a draft instead of publishing it, allowing you to make any edits needed before releasing (Default: `false`).
 - `prerelease`: Mark the release as a pre-release (Default: `false`).
 - `make_latest`: Mark the release as the latest release for the repository (Default: `true`).
 - `release_name`: Explicitly set a release name. (Defaults: implicitly same as `tag` via GitHub API).

action.yml

@@ -24,6 +24,8 @@ inputs:
     description: 'Promote a prerelease to release. Defaults to "false".'
   file_glob:
     description: 'If true the file can be a glob pattern, asset_name is ignored if this is true.'
+  draft:
+    description: 'Mark the release as a draft. Defaults to "false".'
   prerelease:
     description: 'Mark the release as a pre-release. Defaults to "false".'
   make_latest: