Release v2.0.0-alpha.4

[AlexMSmithCA]

• Call prepare in browser (#234)
• Update async rendering for React 16 (#227)

[old-fusion-bot]

Triggered Fusion.js build verification: https://buildkite.com/uberopensource/fusion-release-verification/builds/1647

[old-fusion-bot]

v2.0.0-alpha.3...AlexMSmithCA:auto-release-2.0.0-alpha.4-SBi0njzNe

[codecov]

Codecov Report

Merging #236 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #236   +/-   ##
=======================================
  Coverage   75.09%   75.09%           
=======================================
  Files          13       13           
  Lines         261      261           
  Branches       55       55           
=======================================
  Hits          196      196           
  Misses         48       48           
  Partials       17       17

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