Use longer timeout, fixing entering RAW1 on macOS

[satoshinm]

Trying to get this working on my system (macOS High Sierra), stepping through the code, it was able to send 0x0f and read BBIO1 (entered binary mode), but then it would always fail to enter RAW1 mode:

$ python flashSTM32.py  
Traceback (most recent call last):
  File "flashSTM32.py", line 41, in <module>
    main()
  File "flashSTM32.py", line 18, in main
    busPirate = PirateSWD("/dev/tty.usbserial")
  File "pirate-swd/PirateSWD.py", line 8, in __init__
    self.resetBP()
  File "pirate-swd/PirateSWD.py", line 22, in resetBP
    raise SWDInitError("error initializing bus pirate")
SWDErrors.SWDInitError: error initializing bus pirate

Tracked it down to reading an empty string here:

        if self.port.read(4) != "RAW1":
            raise SWDInitError("error initializing bus pirate")

because the timeout 0.01 is too short. After changing it to 0.1 in this pull request, able to read RAW1 successfully.

[satoshinm]

0.1 seconds may be insufficient, I can get as far as probing an STM32F103C8T6 blue pill board using a Bus Pirate 3.6a with RC6.0 firmware, but when flashing it reads an empty string again. Changing to 1 second works, but then each command takes 1 second to read.