Allow the dot character in options and arguments

[tgockel]

Issue #54.

[codecov-io]

Codecov Report

Merging #55 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #55   +/-   ##
=========================================
  Coverage     82.89%   82.89%           
  Complexity      138      138           
=========================================
  Files            11       11           
  Lines           421      421           
  Branches         83       83           
=========================================
  Hits            349      349           
  Misses           36       36           
  Partials         36       36

Impacted Files	Coverage Δ	Complexity Δ
...main/kotlin/com/xenomachina/argparser/ArgParser.kt	86.95% <100%> (ø)	54 <0> (ø)	⬇️

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[xenomachina]

Looks great. Thanks!