Added support for ie 11

[yashha]

Strange I forked node-wpapi and released the fork, it has different umd than published.

With this fork it is working: https://deploy-preview-68--wp-nuxt.netlify.com/

closes #67

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@8a0aa19). Click here to learn what that means. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #68   +/-   ##
=========================================
  Coverage          ?   31.57%           
=========================================
  Files             ?        2           
  Lines             ?       19           
  Branches          ?        0           
=========================================
  Hits              ?        6           
  Misses            ?       13           
  Partials          ?        0           

Impacted Files	Coverage Δ
lib/module.js	100.00% <100.00%> (ø)

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