Move docstring up so it gets printed again in server

ynca/server.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import annotations
 
 """
 Simple socket server to test without a real YNCA device
@@ -10,6 +9,8 @@
 It is intended to be just enough to test without a real device
 """
 
+from __future__ import annotations
+
 import argparse
 import logging
 import re