Update README.md

README.md

@@ -7,12 +7,12 @@ It runs on all operating systems types offered by GitHub.
 
 You must provide:
 
-- `repo_token`: Usually you'll want to set this to `${{ secrets.GITHUB_TOKEN }}`.
 - `file`: A local file to be uploaded as the asset.
-- `tag`: The tag to upload into. If you want the current event's tag or branch name, use `${{ github.ref }}` (the `refs/tags/` and `refs/heads/` prefixes will be automatically stripped).
 
 Optional Arguments
 
+- `repo_token`: Defaults to `github.token`.
+- `tag`: The tag to upload into. If you want the current event's tag or branch name, use `${{ github.ref }}` (the `refs/tags/` and `refs/heads/` prefixes will be automatically stripped). Defaults to `github.ref`.
 - `asset_name`: The name the file gets as an asset on a release. Use `$tag` to include the tag name. When not provided it will default to the filename.
                 This is not used if `file_glob` is set to `true`.
 - `file_glob`: If set to true, the file argument can be a glob pattern (`asset_name` is ignored in this case) (Default: `false`)