Add annotations import

  Add __future__.annotations import to modules 'datasets' and 'server'

Author: vinisalazar

erddapy/array_like/datasets.py

@@ -1,5 +1,7 @@
 """Classes to represent ERDDAP datasets."""
 
+from __future__ import annotations
+
 from pathlib import Path
 from typing import Union
 

erddapy/array_like/server.py

@@ -1,5 +1,7 @@
 """Class ERDDAPServer to represent an ERDDAP server connection."""
 
+from __future__ import annotations
+
 from erddapy.array_like.connection import ERDDAPConnection
 from erddapy.array_like.datasets import ERDDAPDataset