Ignore UTF-8 errors in serial terminal

Currently whenever the serial terminal encounters invalid UTF-8 bytes it errors:

NOTE: This is an early prototype of the terminal. Nothing is guaranteed to work.

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HException in thread serial-rx-term:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.5/dist-packages/proscli/serial_terminal.py", line 196, in reader
    text = data.decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xad in position 6: invalid start byte

^C
Aborted!

This commit fixes that annoying issue

purduesigbots / pros-cli2

Ignore UTF-8 errors in serial terminal #8