clean up imports in lib/plot.py

lib/plot.py

@@ -1,11 +1,7 @@
-from PyQt5.QtGui import *
-from electrum.i18n import _
-
-
 import datetime
 from collections import defaultdict
-from electrum.bitcoin import COIN
 
+from PyQt5.QtGui import *
 import matplotlib
 matplotlib.use('Qt5Agg')
 import matplotlib.pyplot as plt
@@ -13,6 +9,9 @@ import matplotlib.dates as md
 from matplotlib.patches import Ellipse
 from matplotlib.offsetbox import AnchoredOffsetbox, TextArea, DrawingArea, HPacker
 
+from .i18n import _
+from .bitcoin import COIN
+
 
 class NothingToPlotException(Exception):
     def __str__(self):