add: type processing

Author: TOsmanov

foliant/preprocessors/showcommits.py

@@ -360,9 +360,11 @@ def process_file(self, markdown_file_path):
             with open(markdown_file_path, 'w', encoding='utf8') as markdown_file:
                 markdown_file.write(processed_markdown_content)
 
-    def process_all_files(self, list_of_files):
+    def process_all_files(self, list_of_files: list):
         threads = []
         for markdown_file_path in list_of_files:
+            if isinstance(markdown_file_path, (str, Path)):
+                markdown_file_path = Path(markdown_file_path)
             process_file_thread = threading.Thread(target=self.process_file,
                                                    args=[markdown_file_path])
             process_file_thread.start()