BUG HX711.select_channel - sleep time does not match comments

[dducrest]

select_channel

HX711/HX711_Python3/hx711.py

Lines 83 to 86 in 4faae55

	# after changing channel or gain it has to wait 50 ms to allow adjustment.
	# the data before is garbage and cannot be used.
	self._read()
	time.sleep(0.5)

I noticed that the comment says 50ms, but the time.sleep indicates 500ms.
I think that this is a likely an error that will significantly slow down the rate at which multiple channels are read.

The same conflict in documentation vs implementation appears in set_gain_A