Allows sendemai.email to accept an array of emails

[samhstn]

Ref #86

• [x] Update tests for new functionality
• [x] Implement new functionality in library
• [x] Increment package.json minor version following semver
• [x] Add a small note to README about person.email accepting an array of emails

[codecov[bot]]

Codecov Report

Merging #87 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #87   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          43     43           
=====================================
  Hits           43     43

Impacted Files	Coverage Δ
lib/index.js	100% <ø> (ø)	:arrow_up:

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