refactor(config): drop "files" configure support. Please use "version_files" instead

BREAKING CHANGE:

#82

Author: Lee-W

commitizen/config/base_config.py

@@ -1,4 +1,3 @@
-import warnings
 from pathlib import Path
 from typing import Any, Dict, Optional, Union
 
@@ -34,16 +33,3 @@ def add_path(self, path: Union[str, Path]):
 
     def _parse_setting(self, data: str) -> dict:
         raise NotImplementedError()
-
-    # TODO: remove "files" supported in 2.0
-    @classmethod
-    def _show_files_column_deprecated_warning(cls):
-        warnings.simplefilter("always", DeprecationWarning)
-        warnings.warn(
-            (
-                '"files" is renamed as "version_files" '
-                "and will be deprecated in next major version\n"
-                'Please repalce "files" with "version_files"'
-            ),
-            category=DeprecationWarning,
-        )

commitizen/config/toml_config.py

@@ -44,7 +44,3 @@ def _parse_setting(self, data: str):
             self.settings.update(doc["tool"]["commitizen"])
         except exceptions.NonExistentKey:
             self.is_empty_config = True
-
-        if "files" in self.settings:
-            self.settings["version_files"] = self.settings["files"]
-            TomlConfig._show_files_column_deprecated_warning