add levels

add levels to strip and bus class.

strip level values defined as: pre fader input peak level in dB * 100
bus level values defined as: bus output peak level in dB * 100

__main__.py

@@ -3,7 +3,8 @@ from time import sleep
 
 def main():
     with vban_cmd.connect('potato', ip='ws.local') as vban:
-        pass
+        for i in range(8):
+            print(vban.bus[i].levels.all)
 
 if __name__ == '__main__':
     main()