bug: round hashrate data in MinerData, and remove some unused imports.

pyasic/API/__init__.py

@@ -20,7 +20,7 @@ import json
 import logging
 import re
 import warnings
-from typing import Tuple, Union
+from typing import Union
 
 from pyasic.errors import APIError, APIWarning
 

pyasic/data/__init__.py

@@ -241,7 +241,7 @@ class MinerData:
                 if item.hashrate is not None:
                     hr_data.append(item.hashrate)
             if len(hr_data) > 0:
-                return sum(hr_data)
+                return round(sum(hr_data), 2)
         return self._hashrate
 
     @hashrate.setter