Less nesting of timestamp data

lib/xmet/rawins.py

@@ -56,13 +56,11 @@ class RawinsObs():
 
         now = datetime.datetime.now(datetime.UTC)
 
-        return {
-            'timestamp': datetime.datetime(
+        return datetime.datetime(
             year  = now.year,
             month = now.month,
             day   = day if day < 51 else day - 50
         )
-        }
 
     def parse_surface_pressure(self, value: str):
         if value[0:2] == '99':