Replace subprocess encoding param for python3.5 support

fynncom/fynncom.py

@@ -65,7 +65,7 @@ class FynnWacom:
     @staticmethod
     def _call(cmd):
         # print(" >> Calling: ", " ".join(cmd))
-        return subprocess.check_output(cmd, encoding='utf-8')
+        return subprocess.check_output(cmd).decode()
 
     def guess_devices(self, subname):
         found = False