Fix async watthourmeter

Author: hectorespert

README.md

@@ -41,6 +41,7 @@ async def main():
 
     watt = await connection.watthourmeter()
     print(watt)
+    await connection.close()
 
 asyncio.run(main())
 ```

oligo/asyncio/asynciber.py

@@ -105,7 +105,7 @@ async def measurement(self) -> dict:
 
     async def watthourmeter(self) -> float:
         """Returns your current power consumption."""
-        return await self.measurement()["consumption"]
+        return (await self.measurement())["consumption"]
 
     async def icpstatus(self) -> bool:
         """Returns the status of your ICP."""