Local time support

[pelletier]

Issue: #315

[codecov]

Codecov Report

Merging #318 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #318      +/-   ##
=========================================
+ Coverage   94.59%   94.6%   +<.01%     
=========================================
  Files          10      10              
  Lines        2036    2038       +2     
=========================================
+ Hits         1926    1928       +2     
  Misses         66      66              
  Partials       44      44

Impacted Files	Coverage Δ
marshal.go	92.65% <100%> (ø)	⬆️
tomltree_write.go	95.31% <100%> (+0.03%)	⬆️

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