Adding UNDEFINED pin status

[isidromv]

I'm new to Arduino and as an exercise I'm working on a class encapsulating a digital input. The corresponding read() method returns a PinStatus. Normally it is LOW or HIGH, but an UNDEFINED status is usefull if the corresponding object has not yet been initialised (i.e. the init() method has not been called, which in turn calls pinMode(INPUT)).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.53%. Comparing base (0c853c5) to head (e7558bd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #229   +/-   ##
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  Coverage   95.53%   95.53%           
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  Files          16       16           
  Lines        1075     1075           
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  Hits         1027     1027           
  Misses         48       48           

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