fix: add iso8601 with timezone

[decentral1se]

Closes https://github.com/go-openapi/strfmt/issues/92.

[codecov[bot]]

Codecov Report

Merging #104 (19fb16b) into master (a239ff1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #104   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files          12       12           
  Lines        2019     2019           
=======================================
  Hits         1646     1646           
  Misses        295      295           
  Partials       78       78           

Impacted Files	Coverage Δ
time.go	90.71% <ø> (ø)

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[decentral1se]

Sorry, have moved on since and will most likely not be back to add the test, will close off for now. Thanks for review labours!