fixed formatting issues

API/__init__.py

@@ -79,7 +79,7 @@ If you are sure you want to use this command please use API.send_command("{item}
         data = None
         try:
             data = await self.send_command(command)
-        except APIError as e:
+        except APIError:
             try:
                 data = {}
                 # S19 handler, try again

API/btminer.py

@@ -434,7 +434,7 @@ class BTMinerAPI(BaseMinerAPI):
         enc_command = create_privileged_cmd(token_data, command)
         return await self.send_command(enc_command)
 
-    async def update_firmware(self):
+    async def update_firmware(self):  # noqa - static
         # to be determined if this will be added later
         # requires a file stream in bytes
         return NotImplementedError