updated readme to include 'allow-external-github-orgs' parameter

README.md

@@ -25,7 +25,11 @@ If not specified, the latest stable release will be installed.
 #### `working-directory` (optional)
 A working directory in which `foreman install` will be executed.
 
-If not specified the root job folder will be used
+If not specified the root job folder will be used.
 
+#### `allow-external-github-orgs` (optional)
+A boolean value to allow external github orgs in the foreman manifest file.
+
+If not specified, external github orgs will not be allowed.
 ## License
 setup-foreman is available under the MIT license. See [LICENSE.txt](LICENSE.txt) or <https://opensource.org/licenses/MIT> for details.