Release v1.9.0

[AlexMSmithCA]

• Resolve timing.end on errored requests (#333)
• Allow orphan plugins when registered with a plugin enhancer (#331)
• Implement CI for multiple node versions (#328)
• Enable proxy by default (#327)
• Set koa proxy flag to true in production env (#326)
• Freeze TokenType enum map for Flow (#325)

[old-fusion-bot]

Triggered Fusion.js build verification: https://buildkite.com/uberopensource/fusion-release-verification/builds/982

[old-fusion-bot]

v1.9.0-0...AlexMSmithCA:auto-release-1.9.0-0TIzq-jF6l

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1bf1469). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #334   +/-   ##
=========================================
  Coverage          ?   93.67%           
=========================================
  Files             ?       18           
  Lines             ?      443           
  Branches          ?       86           
=========================================
  Hits              ?      415           
  Misses            ?       15           
  Partials          ?       13

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