passes checks in python3

rowers/utils.py

@@ -439,10 +439,10 @@ def ewmovingaverage(interval,window_size):
 # Custom error class - to raise a NoTokenError
 class NoTokenError(Exception):
     def __init__(self,value):
-	self.value=value
+        self.value=value
 
     def __str__(self):
-	return repr(self.value)
+        return repr(self.value)
 
 class ProcessorCustomerError(Exception):
     def __init__(self, value):