readme: fix incorrect instructions for installing pyserial

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
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Eric Callahan 2022-05-25 12:48:33 -04:00 committed by GitHub
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@ -87,7 +87,7 @@ configured an alternative method of entry.
Before flashing, make sure pyserial is installed. This step only needs to
be performed once:
```
pip install serial
pip3 install pyserial
```
```
python3 flash_can.py -d <serial device> -b <baud_rate>