fixed READE example

README.md

@@ -31,9 +31,9 @@ One can specify the keyword `full` to enable a range of continuous colors from t
 
 TUDPlot also comes with a basic exporter `saveagr`, to save the current matplotlib figure in xmgrace agr format.
 
-    from matplotlib import pyplot as plt
+    import matplotlib.pyplot as plt
     fig = plt.figure()
-    fig.plot([1,2,3], label='Test')
+    plt.plot([1,2,3], label='Test')
     # Do more plotting here...
     # When the figure is complete:
     tudplot.saveagr('test.agr')