Fix exception handling

src/yamaha2mqtt/error.py

@@ -1,4 +1,5 @@
 import logging
+from functools import wraps
 
 class Error(Exception):
     """Base class for exceptions in this module."""
@@ -15,12 +16,13 @@ class ApiInvalidResponseError(Error):
 class ConnectionTimeoutError(Error):
     pass
 
-def exception_handler(func):
-    def inner_function(*args, **kwargs):
+def exception_handler(fn):
+    @wraps(fn)
+    def wrapper(*args, **kwargs):
         try:
-            func(*args, **kwargs)
+            fn(*args, **kwargs)
         except Error:
             logger = logging.getLogger('')
             logger.exception("Internal error occur")
-    return inner_function
+    return wrapper