Added fields to ParameterException for #402

[dhait]

Extra fields have been added to ParameterException (argSpec and value) to allow more granular handling of bad parameters by the user.

[codecov-io]

Codecov Report

Merging #406 into master will decrease coverage by 0.01%.
The diff coverage is 96.29%.

@@             Coverage Diff              @@
##             master     #406      +/-   ##
============================================
- Coverage     89.24%   89.22%   -0.02%     
  Complexity      248      248              
============================================
  Files             4        4              
  Lines          3404     3426      +22     
  Branches        810      810              
============================================
+ Hits           3038     3057      +19     
- Misses          180      183       +3     
  Partials        186      186

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/picocli/CommandLine.java	89.35% <96.29%> (-0.03%)	128 <0> (ø)

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