update Readme

Author: JeremyCCHsu

README.md

@@ -105,6 +105,10 @@ to see if you get results in `test/` direcotry.
 1. This wrapper is an updated version of sotelo's "world.py"<br/>
    https://github.com/sotelo/world.py
 
-## TODO List
+## Acknowledgement
+Thank all contributors ([rikrd](https://github.com/rikrd), [wuaalb](https://github.com/wuaalb)) for making this repo better!
 
+## TODO List
+  
 - [ ] Realtime synthesizer
+

demo.py

@@ -5,8 +5,9 @@
 import argparse
 
 import numpy as np
-#import matplotlib
-#matplotlib.use('Agg')
+
+import matplotlib      # Remove this line if you don't need them
+matplotlib.use('Agg')  # Remove this line if you don't need them
 import matplotlib.pyplot as plt
 
 import soundfile as sf