pep8 change to simple_plot.py

Author: ericmjl

examples/pylab_examples/simple_plot.py

@@ -3,7 +3,7 @@
 
 t = np.arange(0.0, 2.0, 0.01)
 s = np.sin(2*np.pi*t)
-np.plot(t, s)
+plt.plot(t, s)
 
 plt.xlabel('time (s)')
 plt.ylabel('voltage (mV)')