### SUMMARY

Update validate-modules to report messages using named error codes like `version-added` instead of error numbers like `E305`.

This would match the behavior of other tools we use, such as pylint, which have one named error code per rule. This will also make ignore entries much easier to read.

Doing this before 2.9 is released will avoid potential backwards compatibility issues with ignore entries in collections.

##### ISSUE TYPE

Feature Idea

##### COMPONENT NAME

validate-modules

try:
            min_doc_line = min(
                [doc_info[key]['lineno'] for key in doc_info if doc_info[key]['lineno']]
            )
        except ValueError:
            
            return
        max_doc_line = max(
            [doc_info[key]['end_lineno'] for key in doc_info if doc_info[key]['end_lineno']]
        )
        import_lines = []
        for child in self.ast.body:
            if isinstance(child, (ast.Import, ast.ImportFrom)):
                if isinstance(child, ast.ImportFrom) and child.module == '__future__':
                    
                    for future_import in child.names:
                        if future_import.name not in self.WHITELIST_FUTURE_IMPORTS:
                            self.reporter.error(