ATH1 did not return 'OK', or echoing is still ON ELM327.py

[Diegofdez1]

I was getting the following error:

And I have solved it by adding delays in the following lines of elm327.py:

157: r = self.__send(b"ATE0", delay=1)
163: r = self.__send(b"ATH1", delay=1)
169: r = self.__send(b"ATL0", delay=1)

[ddowling]

I think this is the same issue that I reported in #226.
If you want try my fix and let me know how it goes.