Parameter per_page added

doc/api/repositories.md

@@ -17,6 +17,7 @@ Parameters:
 - `path` (optional) - The path inside repository. Used to get content of subdirectories
 - `ref` (optional) - The name of a repository branch or tag or if not given the default branch
 - `recursive` (optional) - Boolean value used to get a recursive tree (false by default)
+- `per_page` (optional) - Number of results to show per page. If not specified, defaults to `20`
 
 ```json
 [