Support drop column for sqlite. (#40)

aerich/cli.py

@@ -23,6 +23,7 @@ from aerich.utils import (
     get_version_content_from_file,
     write_version_file,
 )
+
 from . import __version__
 from .enums import Color
 from .models import Aerich

aerich/ddl/sqlite/__init__.py

@@ -11,9 +11,6 @@ class SqliteDDL(BaseDDL):
     schema_generator_cls = SqliteSchemaGenerator
     DIALECT = SqliteSchemaGenerator.DIALECT
 
-    def drop_column(self, model: "Type[Model]", column_name: str):
-        raise NotSupportError("Drop column is unsupported in SQLite.")
-
     def modify_column(self, model: "Type[Model]", field_object: dict, is_pk: bool = True):
         raise NotSupportError("Modify column is unsupported in SQLite.")
 

aerich/utils.py

@@ -5,7 +5,7 @@ import sys
 from pathlib import Path
 from typing import Dict
 
-from click import BadOptionUsage, Context, ClickException
+from click import BadOptionUsage, ClickException, Context
 from tortoise import BaseDBAsyncClient, Tortoise