Added tkinter note

Author: jerekapyaho

ev_counts.py

@@ -47,3 +47,14 @@
 plt.bar(sorted(list(counts.keys())), values, 
     tick_label=sorted(list(counts.keys())))
 plt.show()
+
+# HUOM.! Jos saat ilmoituksen "serWarning: Matplotlib is 
+# currently using agg, which is a non-GUI backend, so 
+# cannot show the figure.", niin ratkaisu on 
+# asentaa Tkinter: `sudo apt-get install python3-tk`
+
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+