fix(Icon): add mail outline as name

[layershifter]

Fixes #3368.

[codecov-io]

Codecov Report

Merging #3371 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3371   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files         170      170           
  Lines        2812     2812           
=======================================
  Hits         2809     2809           
  Misses          3        3

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[levithomason]

Released in semantic-ui-react@0.85.0.