Fix bug in windows.

CHANGELOG.rst

@@ -3,6 +3,11 @@ ChangeLog
 =========
 0.2
 ===
+
+0.2.1
+-----
+- Fix bug in windows.
+
 0.2.0
 -----
 - Update model file find method.

aerich/migrate.py

@@ -172,7 +172,7 @@ class Migrate:
         """
         temp_config = deepcopy(config)
         path = os.path.join(location, app, cls.old_models)
-        path = path.replace("/", ".").lstrip(".")
+        path = path.replace(os.sep, ".").lstrip(".")
         temp_config["apps"][cls.diff_app] = {
             "models": [path],
             "default_connection": config.get("apps").get(app).get("default_connection", "default"),