Update README.md

Author: ThHanke

README.md

@@ -53,7 +53,7 @@ ckanext.sso.scope = [openid profile email]
 ckanext.sso.access_token_url = [access_token_url]
 ckanext.sso.user_info = [user_info_url]
 ckanext.sso.disable_ckan_login = [True|False]
-ckanext.sso.role = ["member"|"reporter"]
+ckanext.sso.role = ["member"|"editor"|"admin"]
 ```
 
 ## Usage