plot_input example: 'off' -> False

This avoids the message

    MatplotlibDeprecationWarning:
    Passing one of 'on', 'true', 'off', 'false' as a boolean is deprecated; use an actual boolean (True/False) instead.

Author: mgeier

examples/plot_input.py

@@ -100,8 +100,8 @@ def update_plot(frame):
     ax.axis((0, len(plotdata), -1, 1))
     ax.set_yticks([0])
     ax.yaxis.grid(True)
-    ax.tick_params(bottom='off', top='off', labelbottom='off',
-                   right='off', left='off', labelleft='off')
+    ax.tick_params(bottom=False, top=False, labelbottom=False,
+                   right=False, left=False, labelleft=False)
     fig.tight_layout(pad=0)
 
     stream = sd.InputStream(