bluerobotics / bluerobotics/ping-python

Wrong 'serial' module present can cause strange errors

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Python
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Description

The ['serial'](https://pypi.org/project/serial/) package can cause some mistakes.
the correct one is 'pyserial'

error in python2:

```
python2 simplePingExample.py --device /dev/ttyUSB0 --baudrate 115200
Opening /dev/ttyUSB0 at 115200 bps
Failed to open the given serial port
('\t', AttributeError("'module' object has no attribute 'Serial'",))
```
Python3:
```
Failed to open the given serial port
module 'serial' has no attribute 'Serial'
```

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