minor modifications for pylint

lisainstrument/hexagon.py

@@ -108,7 +108,7 @@ class Hexagon():
         # Three-signal combination
         self.three_signal_combination = self.carrier_beatnotes[:,0] \
             + self.carrier_beatnotes[:,1] + self.carrier_beatnotes[:,2]
-            
+        
     def write(self, output='measurements.h5', mode='w'):
         """Write simulation results.