Upgrade flow to 0.93.0

[lhorie]

Fixes a koa flow-typed def regression

[KevinGrandon]

Looks good, but seems like eslint is failing here. I think previously it looks like we must've run eslint --fix and added // eslint-disable-next-line. That's not quite ideal, so I suppose we should skip the flow-typed folder if possible.

[codecov]

Codecov Report

Merging #358 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #358   +/-   ##
======================================
  Coverage    93.2%   93.2%           
======================================
  Files          18      18           
  Lines         456     456           
  Branches       91      91           
======================================
  Hits          425     425           
  Misses         17      17           
  Partials       14      14

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[lhorie]

That's weird. This shouldn't have passed CI before..

Fixed now

[old-fusion-bot]

Triggered Fusion.js build verification: https://buildkite.com/uberopensource/fusion-release-verification/builds/1482