fix styling issues in migrations (#249)

edgy/cli/templates/default/script.py.mako

@@ -9,6 +9,7 @@ Create Date: ${create_date}
     from edgy.utils.hashing import hash_to_identifier, hash_to_identifier_as_string
 %>
 from __future__ import annotations
+
 from alembic import op
 import sqlalchemy as sa
 ${imports if imports else ""}

edgy/cli/templates/plain/script.py.mako

@@ -6,6 +6,7 @@ Create Date: ${create_date}
 
 """
 from __future__ import annotations
+
 from alembic import op
 import sqlalchemy as sa
 ${imports if imports else ""}

edgy/cli/templates/url/script.py.mako

@@ -9,6 +9,7 @@ Create Date: ${create_date}
     from edgy.utils.hashing import hash_to_identifier, hash_to_identifier_as_string
 %>
 from __future__ import annotations
+
 from typing import TYPE_CHECKING, Optional
 
 from alembic import op
@@ -28,15 +29,15 @@ depends_on = ${repr(depends_on)}
 ${hash_to_identifier_as_string}
 
 
-def upgrade(url: Optional["DatabaseURL"] = None) -> None:
+def upgrade(url: Optional[DatabaseURL] = None) -> None:
     urlstring = "" if url is None else f"{url.username}:{url.netloc}"
     # hash_to_identifier adds already an "_"
     fn = globals().get(f"upgrade{hash_to_identifier(urlstring)}")
     if fn is not None:
         fn()
 
 
-def downgrade(url: Optional["DatabaseURL"] = None) -> None:
+def downgrade(url: Optional[DatabaseURL] = None) -> None:
     urlstring = "" if url is None else f"{url.username}:{url.netloc}"
     # hash_to_identifier adds already an "_"
     fn = globals().get(f"downgrade{hash_to_identifier(urlstring)}")