Fix datetime imports

 import pendulum
-import pendulum.datetime
+from pendulum.datetime import DateTime
 
 __all__ = ["parse_dt", "now"]
 
 
-def parse_dt(dt: str, **options) -> pendulum.datetime.DateTime:
+def parse_dt(dt: str, **options) -> DateTime:
     """Parse `dt` and return a datetime object."""
     return pendulum.parser.parse(dt, **options)
 
 
-def now() -> pendulum.datetime.DateTime:
+def now() -> DateTime:
     """Return the current datetime."""
     return pendulum.now("UTC")